The GRID® Foam Roller, the original hollow core roller, features a patented multi-density foam surface that delivers firm compression like a sports massage while channeling blood and oxygen needed to repair muscles. The GRID® Foam Roller is the 'go-to' roller to release muscle pain and tightness, improve mobility, increase circulation, and is recommended by sports doctors, chiropractors, and physical therapists.

• Three-dimensional surface allows tissue to aerate while you roll, promoting the flow of blood and oxygen, the nutrients needed to repair muscles.

• Proprietary Distrodensity zones replicate the feeling of a massage therapist's hands.

• Hard, hollow core hand-wrapped in EVA foam makes it firmer than traditional foam rollers.

• Superior construction won't break with repeated use.

• For beginners to advanced rollers.

• Easy-to-clean and sweat-resistant EVA foam surface.

• 13-inch foam roller is 5.5 inches in diameter with a 500-pound weight limit.

• Includes access to free online instructional video library on foam rolling education from the experts at TriggerPoint.