Elastic hook and loop fastener ensures comfortable fit and stabilisation during activities the thermal wrist support for tenosynovitis carpal tunnel syndrome and general wrist support provides firm support around weakened and strained area retains heat to relieve pain size guide measure the circumference of your wrist 56 66 67 78 13 015 2cm 15 617 2cm 17 519 1cm 19 421 0cm small medium large x large