Leather is the band that makes an Apple Watch look like it belongs in an office. It is also the band people most often buy once, wear badly, and replace within a year. Most of that comes down to a few things nobody mentions at the point of sale.
Which size do you need?
Apple groups its cases into two band sizes. The smaller covers 38mm, 40mm and 41mm, plus the 42mm case on Series 10 and later. The larger covers 44mm, 45mm, 46mm and the 49mm Ultra, plus the 42mm case on Series 3 and earlier.
The 42mm case appears in both groups because Apple used that size twice, a decade apart, with different band connectors. Check your series in Settings, General, About before ordering.
Otherwise bands are interchangeable within a group across series, so a leather band bought for an older watch fits a newer one of comparable size.
The styles
Classic buckle straps are the most watch-like: a single piece of leather with a pin buckle. Slim versions suit the 40mm and 41mm cases particularly well.
Modern-style straps use a magnetic closure and tuck the tail away, which gives a cleaner line at the wrist.
Loop and link designs use magnets throughout rather than a single clasp, so they adjust continuously rather than by hole.
Hybrid leather and silicone puts leather on top and silicone underneath. You get the look from the outside and sweat resistance against the skin. If you want one band that covers work and the gym, this is the honest answer.
Leather and water do not mix
This is the main thing to understand. Leather absorbs water, stiffens as it dries, and eventually cracks at the fold points.
One accidental soaking will not ruin a good band. Wearing it in the shower every morning will, within months. If you shower or swim with your watch on, leather needs to be a second band rather than your only one.
Sweat does the same thing more slowly. A leather band worn through daily workouts will stiffen and discolour on the underside long before the top surface shows any wear.
Getting the fit right
Leather is the least adjustable band type, because you are limited to the holes punched in it. That matters more than it sounds.
The Apple Watch reads heart rate optically, and it needs steady skin contact. Wrists swell through the day and in heat, so a leather band set to the hole that is right at 9am can be slightly tight by evening, or the reverse.
If your readings during exercise look erratic, band fit is the first thing to check. For workouts specifically, a silicone or woven band you can adjust finely will always beat leather.
Making it last
Take it off before showering. Let it dry naturally if it does get wet, away from direct heat, since a radiator will cook it.
Rotating between two bands roughly doubles the life of both, because leather recovers between wears rather than staying permanently compressed at the same fold.
Changing the band
Hold the watch face down, press and hold the release button on the back of the case, and slide the band sideways out of its channel. Slide the new one in until it clicks.
Check the buckle faces the same way as the old band. It is easy to fit one half inverted and not notice until you try to fasten it.
Who leather is right for
If you wear your watch to an office and take it off to train, leather is the best-looking option available and worth the care it needs.
If you wear it around the clock, including sleep and swimming, buy a hybrid or keep leather as your second band.
Shop Apple Watch bands, or read our guide to Apple Watch metal bands.
