The GRID 1.0 is the most versatile and effective foam roller in the TriggerPoint line. It features a hollow core design that's more durable than traditional foam rollers, helping it retain its shape after continued use to deliver a consistent feel and optimal performance. The EVA foam surface is water-resistant and sweat-resistant, making it easy to clean, while its smooth foam composition rolls comfortably against skin. It also features our patented GRID pattern that replicates a massage therapist's hands in three unique configurations: flat areas like the palm for addressing large muscles, tubular ridges that knead muscles like the fingers, and dense nodules for applying targeted pressure like fingertips. It's like getting three foam rollers in one. Combined, the hollow core construction and GRID pattern let you customize the feeling of your self-massage experience, from light pressure to deep tissue sensations. Perfect for those new to foam rolling and experienced users alike, the GRID 1.0 is the ideal self-massage tool for addressing muscle and soft tissue tightness and discomfort, helping to increase circulation, improve mobility, and ease the tension of sore muscles in the legs, arms, shoulders, back, and neck.