Velcro

After much use, it’s possible for the velcro to lose some of its adhesion.

Adhesion loss can be increased by activities such as frequently opening and closing it or while cleaning your gloves.

Prevention

Obviously you can’t avoid opening and closing your gloves altogether, so instead you can focus on making sure you keep the velcro closed when washing your gloves.
That way the hooks on the hard side and the loops on the soft side of the velcro won’t be damaged by abrasion or rubbing, thus reducing the potential to fray them.

Repair

1. If your velcro no longer holds tight, first check which side of the strap is affected
2. Velcro bands consist of two side. The one side is soft and the other feels hard (with little hooks)
3. If the hooks are bent and twisted, they will no longer provide a strong hold. Try to run a straight knife against the grain of the little hooks. This will sort them out again and the velcro will hold better again
4. If the soft side is covered in fuzz or fluff it will prevent the velcro from holding tightly, but you can easily get it up running again. Remove the fuzzy and fluffy pieces with a wire brush, a hard comb or a needle
5. If the soft side of the velcro strap is frayed, then the velcro fibres will remain further apart and that will keep the hooks from catching the loops. In such a case, you can cut off the frayed pieces with scissors