our bracelets move with your body :) ideal for working out or jobs and hobbies that are hands-on. sweat, swim, stretch, and sleep without worry. be cautious with physically or chemically abrasive material or solution(s) as they can potentially snag and/or corrode the elastic band (loofahs in the shower, nail polish remover, paint thinner, etc.), ultimately destroying your bracelet. please contact us with any specific durability and sizing questions: byal4u@gmail.com or through social media at @by__al