Sera — Magnetic Silicone Sport Strap — Apple Watch
Size & Compatibility
Finding Your Size
No guessing, no charts — just read the case size in millimeters on the back.
Step 1 — Confirm the mm size
Gently wipe the case back and look for mm. Examples: 41mm, 45mm, 49mm.
Step 2 — Pick your size
Pick the matching variant on the product page for a perfect click-in fit.
Strap Compatibility
Apple’s strap system is designed to be stable across generations. That’s why an older 38mm strap still fits a new 41mm case, and why a 44mm strap locks perfectly into a 45mm or 49mm Ultra. Know your size family once; buy with confidence forever.
•Small Family (38/40/41 mm)
→ Series 1–9 (small), SE
•Large Family (42/44/45/49 mm)
→ Series 1–9 (large), SE (large), Ultra & Ultra 2 (49mm)
Your watch’s name may change when you upgrade — the connector family doesn’t.
Product specification
- Compatible with: Apple Watch
- Color: Neon Lime, Ivory, and Green
- Material: Silicone
- Closure: Magnetic Slide
- Fit: Adults
- Style: Modern, Everyday, and Sporty
- Pattern: Textured
- Strap style: Sport Loop
- Lifestyle: Casual, Sport, and Travel
Description
An Apple Watch strap that pinches, slips or needs constant readjusting turns a small daily habit into a daily irritation. Between workouts, commutes and back-to-back meetings, a strap that never quite sits right is the last thing you want on your wrist.
The Sera silicone strap for Apple Watch answers that with soft matte silicone and a magnetic link closure. Available in Neon Lime, Ivory and Green, it adjusts in seconds — no buckles, no loops, no fixed holes to settle for.
- Dense, high-grade silicone with a smooth matte finish that resists wear, cracking and fading, and never feels sticky against the skin.
- A reinforced neodymium magnetic link system holds its position firmly while the segmented links micro-adjust to the exact shape of your wrist.
- Precision-engineered lugs align cleanly with your Apple Watch for a stable, wobble-free fit, and the sweat-resistant silicone takes everyday wear, walks and casual training in stride.
Two sizes cover the whole Apple Watch range: pick 38 · 40 · 41 · 42 mm or 44 · 45 · 46 · 49 mm (Ultra) to match the case size engraved on the back of your watch. It fits every model from Series 3 through Series 10, plus SE and Apple Watch Ultra.
Give your Apple Watch a strap that adjusts in a second and stays put all day. Order the Sera silicone strap in Neon Lime, Ivory or Green and feel the difference from the first wear.
Trademark Notice
Tried, Tested, Trusted
Swapped in, worn out—here’s the verdict.