Fitness trackers and smartwatches want to live on your wrist 24/7.
This loose fit allows air to contact your skin as the watch moves around during the day.
This way, no part of your skin gets moisture or sweat trapped against it.
GarminandApple(to name a few) all say basically the same thing.
This lets you get a nice, snug contact between the heart rate sensor and your skin.
But once the workout is over, loosen the watch back to a more comfortable position.
But during a workout, if you venture to slide the watch, your skin should move with it.
Check the care instructions that came with your gadget; you may be advised tonotuse soap.
If this is an ongoing issue for you, consider a fabric watch band that breathes a little better.
For example, heres afive-pack of elastic bands that fit the Fitbit Charge 6.
Whatever your gadget, there are probably a ton of third-party bands out there in a variety of materials.
A pro tip, though: if youre going to get a fabric band, get two.
Its also OK to simply not wear the watch for a while.
