Made with 30% renewable, biobased materials, in addition to EVA foam and a recycled plastic core Three-dimensional surface allows tissue to aerate while you roll, promoting the flow of blood and oxygen, the nutrients needed to repair muscles Proprietary Distro density® zones replicate the feeling of a massage therapist's hands Hard, hollow core hand-wrapped in biobased materials and EVA foam makes it firmer than traditional foam rollers Superior construction won't break with repeated use For beginners to advanced rollers 13-inch foam roller is 5.5 inches in diameter with a 500-pound weight limito Includes access to free online instructional video library on foam rolling education from the experts at TriggerPoint