New Apple Watch, New Sizing? Everything You Need to Know About Series 10 Bands

Thinking about upgrading to the Apple Watch Series 10 ? You're not alone—and if you’re like most users, your next question is probably: Will my old watch bands still fit? The answer isn’t as simple as it used to be. Here’s a complete breakdown of what’s changed, what it means for your existing straps, and how to find the perfect new band for your Series 10.

What’s New with the Apple Watch Series 10?

The Apple Watch Series 10 brings a bigger, bolder design—literally. With edge-to-edge displays, improved battery life, side speakers, and upgraded internals, it’s a standout in Apple’s lineup. But one of the most talked-about changes? The watch’s sizing system, which is catching a lot of long-time users off guard.

What Size Strap Do I Need for My Apple Watch Series 10?

While many watch band companies have their own way of helping you choose the correct size, we like to keep things simple.

• If you’ve ordered the Small Series 10 Apple Watch (42mm), just choose Small Apple Watch when selecting your strap size.
• If you’ve ordered the Large Series 10 Apple Watch (46mm), go with Large Apple Watch when picking your strap.

Easy, right?

And don’t worry—if you’re shopping later and forget which option you need, we’ve got your back. On each product page, you’ll find a helpful link just above the size selector that says: “Find Your Strap Size Here”. Click that, find your Apple Watch series and size, and it’ll tell you exactly which strap size you need. No second-guessing required.

Band Compatibility: Why Your Old 42mm Band Won’t Fit the New 42mm Watch

Here’s where it gets a little tricky: if you’ve used a 42mm Apple Watch before, you might assume that a Series 10 42mm watch would work with the same strap. Unfortunately, that’s not the case.

Why not? Previously, the 42mm Apple Watch was considered the large size and required a wider adapter due to its larger lug width.

With the new Series 10, the 42mm size is now classified as the small Apple Watch and features a narrower connection point (lug width). This means it now uses a smaller adapter.

So, while the size name (42mm) hasn't changed, the actual fit has. Older 42mm straps will not fit the new Series 10 42mm watch.

Now, if you have the new Series 10 46mm Apple Watch, your old 42mm straps will work perfectly!

Choosing the Right Band Material for Your Apple Watch Series 10

At BluShark, we offer a wide range of high-quality bands that match both your style and your lifestyle. Here’s a quick breakdown of the most popular strap materials and what they’re best suited for:

Silicone - Shop Silicone Apple Watch Compatible Bands

• Best For: Everyday use, workouts, swimming
• Pros: Lightweight, flexible, water-resistant
• Cons: Slightly less durable over long periods; can attract lint

FKM Rubber - Shop FKM Rubber Apple Watch Compatible Bands

• Best For: High-impact activities, rugged environments
• Pros: More durable than silicone, stronger resistance to heat and chemicals
• Cons: Slightly firmer feel compared to silicone

Nylon - Shop Nylon Apple Watch Compatible Bands

• Best For: Casual wear, breathable comfort, mid-level outdoor activities
• Pros: Lightweight, dries quickly, incredible strength, tons of colors
• Cons: Less water-resistant than rubber-based materials

Canvas - Shop Canvas Apple Watch Compatible Bands

• Best For: Rugged style, casual wear
• Pros: Unique texture, durable feel
• Cons: Can absorb water, needs occasional cleaning

Leather - Shop Leather Apple Watch Compatible Bands

• Best For: Office wear, formal occasions, casual daily wear
• Pros: Classic look, softens over time, adds sophistication
• Cons: Not water-resistant, may show wear more quickly

Frequently Asked Questions About the Apple Watch Series 10 and Bands

Q: Can I use my old Apple Watch bands with the Series 10?
A: Possibly—but be careful. A 42mm band from a previous model won’t fit the new 42mm Series 10. Double-check width compatibility before attaching older straps.

Q: What adapter size do I need for the Series 10?

• 42mm Series 10 → Small adapter

• 46mm Series 10 → Large adapter

Q: Which material is best for an active lifestyle?
A: FKM rubber and silicone are both great, but FKM is more rugged and long-lasting.

Q: Can I swim with all band types?
A: Stick with silicone, FKM rubber, or nylon for water resistance. Leather is best kept dry.

Q: How Do I Clean Apple Series 10 Watch Bands?
A: Check out our blog post on Cleaning Apple Watch Bands! 

Q: Do My BluShark Straps Come With A Warranty?
A: Yes! We provide a free lifetime warranty! 

Want help picking the perfect strap for your new Apple Watch Series 10? Explore our collection and find your fit.

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