It is Kinesio tape, used for sore muscles, injuries, and healing. Many Olympic athletes have used it this year.
Its where their batteries go.
It's kinesio tape, sort of an alternative to an elastic bandage:
It is tape. Used for protection and strength.
K-tape, it helps to relieve sore muscles and joints
Many divers wear Kinesio Tape on their backs. Kinesio Tape is used to help manage pain for a variety of bone, muscle, and joint issues.
It's Physiotherapy/Kinesiology tape, for support of injuries.
To proect their bones from breaking