It's Physiotherapy/Kinesiology tape, for support of injuries.
Its where their batteries go.
It is tape. Used for protection and strength.
It's kinesio tape, sort of an alternative to an elastic bandage:
its called kinesio tape---it helps relieve soreness on the joint that its on
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.
To keep their skin looking tight.
It is Kinesio tape, used for sore muscles, injuries, and healing. Many Olympic athletes have used it this year.
Called Kinesio tape and developed by a Japanese doctor more than 30 years ago, the adhesive strapping is designed to provide muscle and joint support without restricting movement.
the suits have to be stream line to move faster in the water