Set of 5 different tensile force(5/15/20/30/40LB) bands come with complimentary instruction book and waterproof bag. High end exercise bands. Our heavy duty resistance loop bands are made of 100% natural latex â free of non-natural Thermoplastic Elastomer (TPE) and no rubber smell. This makes them perfect whether you are just starting to workout or a seasoned workout warrior. Our extra light and light bands are great for beginners while our medium heavy and extra heavy exercise bands are targeted for more intermediate and advanced strength training. Start Workout Anywhere. With lightweight carry bag you can easily take fitness bands to the office gym or travel. Perfect gift choice for friends and family build healthy and fitness lifestyle together. Multiple uses. While these resistance bands are often used for sports and fitness physical therapists love these physical therapy bands (rehab bands) to help them rehabilitate their patients.