Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Strap
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps

Theca Magnetic Silicone Strap

Theca Magnetic Silicone Strap

Regular price £24.99 GBP
Regular price £49.99 GBP Sale price £24.99 GBP Save £25.00

In Stock - Fast Shipping With Royal Mail

Strap Colour: Black
Strap Width: 38MM / 40MM / 41MM / 42MM-S10/S11/S12

Buy More and Save!

Buy 2 & Save 5%
£47.48 £49.98
Buy 3 & Save 10% Popular
£67.47 £74.97
Buy 4 & Save 15% Best value
£84.97 £99.96
  • Free Shipping Orders £40+
  • Easy Returns
  • 100 Days Guarantee

Effortlessly modern and endlessly functional, the Theca Magnetic Silicone Strap brings a fresh edge to your Apple Watch. Its slim profile and smooth finish pair perfectly with an upgraded magnetic clasp that locks in place with satisfying precision.

Made from waterproof, sweatproof silicone, this feels light yet secure, staying comfortable from your first morning run to your late-night plans.

Features:

  • Upgraded Magnetic Clasp delivers an extra-strong, secure hold all day
  • Lightweight Silicone Build keeps your wrist cool and comfortable
  • Sleek and Stylish Design complements any outfit or setting
  • Sweatproof and Waterproof for daily wear and fitness routines
  • Easy to Clean surface resists buildup and maintains its shine
  • Slide-and-Click Installation allows quick, tool-free changes
  • Breathable Construction for comfort during extended wear
  • Available in 12 Colours to match your unique style

Details & Compatibility

  • Fits Wrist Size:
    • 150mm - 220mm (5.9"- 8.7")
  • Compatible with: 
    • Apple Watch Series 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, SE, SE 2, SE 3, Ultra, Ultra 2, Ultra 3, and Ultra 4

Shipping and returns

Shipping

We offer FREE Tracked shipping on all orders over £40! For orders under £40, we charge £3.95. 📦

We process orders between Monday and Friday. Please note that we require 2 to 3 working days on average to fulfill your order before dispatching it. Rest-assured we are doing everything in our power to get your order to you as soon as possible!

Once your order is dispatched, estimated delivery time is between 5 to 10 business days. Please consider any holidays or global events that might impact delivery times.

Returns

We offer hassle-free returns to our nearest dispatch centre. To start a return just contact our support team at support@astrastraps.co.uk and we will make the process easy and effortless.

Please Note:  Due to delays caused by huge pressure on international and local shipping companies, orders may be delayed for arrival.

Our guarantee

The Astra Standard
Engineered for quality. Protected by our guarantee.
Premium Build
Rigorous QC checks ensure every strap meets the highest tier of durability.
100-Days Guarantee
Full coverage against defects, Faults. 
Insured Shipping
Free tracked shipping over £40. We cover any loss in transit.

Size guide

At Astra Straps, all our straps have specific and clear sizes indicated. Please check the sizing guide below before ordering. If you are still unsure, you may contact us here.


1. How do I know my wrist size?

Simply use a flexible measuring tape to wrap around your wrist and record the measurement on the tape that overlaps the zero end of the tape OR just grab any string/paper strips to do the same, then lay the string on a ruler to get your accurate wrist size.

In most cases, knowing your wrist size/length will be sufficient. Check your wrist size against the size of the strap that you wish to purchase on the individual product details page.

From there, you can select and purchase our watch straps: Small (S), Large (L) or Free Size.



2. What is the watch band width / watch lug measurement?



In certain cases, knowing your wrist size alone may not be sufficient. In such a scenario, you will need the watches' band width size, also know as the watch lug width size.

Place the watch with the watch face facing up. Take the measurement of the distance between the lugs (where the watch strap fits).

For Apple Watches you have the choice between 38MM, 40MM, 42MM & 44MM, you can enter your watch model number into a search engine to find what size your watch uses.

With these two pieces of measurements, you are now ready to grab your strap!

Ask a question

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Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps
Theca Magnetic Silicone Band - Astra Straps

Questions? We've Got Answers! ⭐

Real talk about your new favorite watch band

Will this actually fit my watch?

Absolutely! Whether you’re rocking the original Series 1 or the latest model, we’ve got you covered. Just check the size on the back of your watch (if you're not sure), and we'll handle the rest. It’s that easy.

What makes Astra Straps different?

Great question! At Astra Straps, we don’t just make bands – we craft them.

Every single band is hand-finished to ensure the highest quality and attention to detail. We’re all about combining top-notch materials with unique designs that reflect your personal style.

Plus, we test every band for comfort and durability, so you can count on a strap that’s as strong as it is stylish. When you choose Astra Straps, you’re not just getting a band – you’re getting a piece of wearable art.

Is it really comfortable, or just good-looking?

Why settle for one when you can have both? Our bands are designed to look amazing and feel just as great.

We’ve obsessed over comfort, so you don’t have to. No weird pinching or “I need to take this off” moments – just a band that feels as good as it looks.

Will it stand up to my crazy life?

We’ve put our bands through the wringer because we know you don’t have time to baby your watch.

Whether you're hitting the gym, caught in the rain, or dealing with your most accident-prone friend, these bands are built to last. Bring on the hustle!

How do I pick the right size?

Most people use a tape measure (or even just a string) to wrap around their wrist, then add half an inch. But don’t stress – most of our bands are super adjustable, so unless your wrists are tiny or extra large, the standard size should work just fine. Still not sure? Reach out to us, we’re here to help!

What if I don’t love it?

We get it – sometimes things just don’t work out. If you’re not in love within 100 days, send it back, no questions asked. We’ll refund you, no drama. We want you to have a band you absolutely love.

When will it get here?

We’re all about speed. Most orders ship within 1-2 days, and you can expect it to arrive shortly after.

Plus, if you spend over £40, shipping is on us. Because let’s be real, no one wants to pay extra for shipping.

Do I need to buy anything else?

Nope! We believe in keeping things simple. Everything you need is in the box. No sneaky extra fees or “must-have” connectors. Just open it, snap it on, and you’re good to go.

How do I keep it looking fresh?

Super easy! Silicone bands just need a quick rinse with soap and water. Leather ones? Just a gentle wipe down.

Metal ones can be cleaned with a soft cloth. And don’t worry – we’ll send you a full care guide, but these bands are pretty low maintenance.

Customers praised this magnetic silicone strap for its premium quality and comfort. Many said it "feels like an official Apple strap" with elegant colours and a refined finish. The magnetic closure is "ridiculously convenient" with micro-adjustability. Shoppers loved its versatility for gym, work, and daily wear, noting it's sweat-resistant and breathable.

  • 5 stars: 35 (71%)
  • 4 stars: 9 (18%)
  • 3 stars: 5 (10%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
O
Omar Khan
Nice quality

Gave it as a gift and they thought it was an official Apple strap based on the quality and finish.

M
Meagan Harper
Sweat-Friendly

Even after sweating at the gym, it didn't trap moisture or get funky. Wiped clean and looked fresh again.

T
Tracy Wilkins
Luxe Colours

The starlight colour looks even better in real life, soft, elegant, and makes the Apple Watch look more expensive.

K
Kenna Wallis
Simple & Premium

Great gift for someone who prefers simple but premium-looking accessories, feels more personal than just another case or charger.

K
Kourtney Taiaroa
Leather Convert

I've always worn leather straps but this magnetic silicone one is so much lighter and easier to live with day to day.

M
Moshe Kauri
Fast On/Off

I take my watch off a lot during the day and this magnet system makes it effortless. Stays secure too, which matters.

B
Bryn Raukawa
Minimal & Neat

This is the kind of strap you forget you're wearing until someone compliments it. Minimal, neutral, fits any outfit.

A
Abigale Reid
Never Going Back

Didn't think I'd care about the closure type until I tried this. Now buckle straps feel prehistoric.

T
Tamera Morgan
Colour + Comfort

I bought it for the colour and stayed for the comfort. The tone is subtle and really flattering on skin.

A
Aaron Bennett
Gift-Worthy

Bought one for my wife and she immediately asked where I got it, now she wants another colour.

K
Kaitlynn Sullivan
Looks Refined

Never thought I'd like a silicone strap this much, it actually looks neat and polished instead of sporty childish.

N
Nicholas Rutherford
Immediate Upgrade

Bought one for my brother and he replaced his old strap right away. Said it felt "expensive" in the best way.

D
Dustyn Gray
Wearing Daily

Got two, one for me and one for a friend. We both ended up wearing them daily.

G
George Tui
Fashion Feel

Colours look premium, not plastic. The finish makes them feel more like a fashion piece than a sporty strap.

E
Elaina Ruru
Subtle Shade

Got the mint accent one and it's unique without being loud. People notice it right away.

J
Jessenia Henderson
Shared strap

Both me and my partner ended up sharing it because the style is universal, not feminine, not masculine, just sleek.

J
Janet Harris
Neutral Pink

The pink sand is the perfect neutral, not childish, not bright, just a soft classy tone that goes with everything.

T
Terrance Te Ao
Lightweight Win

Lighter than leather, softer than steel, and somehow still feels like a "real" strap, not a downgrade.

E
Eli Paora
Metal Upgrade

I switched from a metal strap and I don't miss the weight or hair-pulling at all. This is way more comfortable.

C
Connor Taimana
Perfect Gift

It's the kind of thing you can gift to anyone with an Apple Watch and know they'll actually use it.

M
Misael Tipene
Zero Buckles

You don't realize how annoying buckles are until you switch to a magnet strap. Takes two seconds to put on or adjust.

A
Ariel Collins
Magnet Win

The magnetic closure is ridiculously convenient, no buckles, no holes, just snap and go. I'm never going back to traditional straps.

A
Alora Manawa
Premium Packaging

The packaging and finish make it feel like a higher-end purchase than the price suggests.

D
Drew Hemi
Gym-Proof

I've worn this while working out and the magnet never slipped once, but it's still easy to remove at night.

C
Cedric Whaitiri
Better Than Loop

Came from a Milanese loop and this is way easier to adjust and doesn't pinch at all.

A
Annmarie Thompson
Great Value

For the price, this is a steal. Premium look, premium comfort, no corners cut.

D
Diana Ranginui
Elegant Purple

The smoke purple is stunning, it adds personality without screaming for attention.

C
Cori Te Rangi
Daily Favorite

I bought this for my Apple Watch and it instantly became my daily strap, clean look, super easy to wear, no bulk.

J
Jerome Webb
Sleep-Friendly

Lightweight enough to sleep in, tough enough to use during training. Not many straps hit both.

L
Leila Tapu
No Sweat

No sweat rash, no sticky feeling. The silicone stays smooth even after a long day of heat and movement.

S
Sherry Hadley
All-Rounder

Works with casual clothes, workwear, gym days, it's one of those "does everything without trying" accessories.

J
Jamar Watene
Micro-Adjustable

Being able to adjust in tiny increments instead of preset holes is a game changer for comfort.

M
Mari Peterson
Better Than Apple

I've paid triple for Apple straps that weren't half as comfortable. This one actually feels like an upgrade.

M
Myles Tane
Soft & Smooth

Some silicone straps grip too hard, this one stays soft and breathable. I never had to adjust it once.

Why 100,000+ Customers Choose Astra Straps

390+ Styles. Premium quality. Prices that actually let you switch it up.

Endless

Style

Match every mood,
outfit, occasion

Premium

Materials

No cheap

plastic here

Built

To Last

Survives workouts, adventures, life

Perfect

Fit

Comfortable

from day one

100 Day

Warranty

We’ve got you covered for 100 days

  • “I recently got the Astra Apple Watch band and am very impressed with its quality and stunning design. Right from the packaging, it was clear this band was made with great care. The premium-grade silicone is soft against the skin, comfortable for all day wear, and durable enough for an active lifestyle. Im thrilled with my purchase."

  • “Don't waste money on expensive Apple bands. This one is stylish, fits well, and is excellently made. You can get several of these for the price of one official band."

  • “Ive had many Apple watch bands over the years, and this is the best, coolest, and most comfortable one yet. It makes the watch look extremely upscale. A friend paid much more for the same band elsewhere and couldn't believe my price. Highly recommended. Love!"

  • “Amazing quality, very flexible and not stiff like other straps. Doesn't have that cheap band smell. Highly recommend, and great to have the option to match the strap color with my style."

  • “I was looking for a band thats not only exceptionally comfy but also stylish and durable. These bands tick all those boxes. I appreciate the bands design where it tucks in neatly. My original band caught on everything, but this one has a much smoother design. I love it!"

  • “Astra Straps' customer service is top-notch. I had a question about sizing, and they responded promptly with helpful guidance. It's refreshing to see a company that values its customers."

  • “Astra Straps has been a game-changer for my watch collection! Their bands are not only stylish but incredibly durable. I've swapped out all my old bands for Astra and couldn't be happier."

  • “The watch bands fit perfectly around my wrist as there are plenty of holes to adjust to my wrist size. The colors are very nice. The feel of the band is smooth. The way the band clasps is a plus as it is very secure on my wrist."