100% Synthetic fabric. For Common Injuries (Not clinically proven for all injuries): carpal tunnel; hamstring strain; wrist pain; runner's knee; neck strain; calf strain; shoulder pain; achilles tendonitis; tennis elbow; plantar fasciitis; golfer's elbow; shin splints; rib pain; ankle sprain; gluteus pain; quad strain. KT Tape Original vs. KT Tape Pro: Original: all-natural cotton; comfortable to wear; 1-3 days of wear; good level of support. Pro: engineered synthetic; comfortable to wear; 4-7 days of wear; best level of support; reflective safety print; protective case; water resistant. Elastic sports tape for pain relief & support (not clinically proven for all injuries). Train longer. Finish stronger. Non sterile. FSA eligible.