Amazon.comThe Grid, by Trigger Point Performance, is a versatile and comprehensive foam roller, with unique Distrodensity Zones, a matrix of varying widths and densities that allows for a precision massage based on individual needs. Just as a massage therapist uses different parts of the hand and arm to manipulate different muscle groups, The Grid's Distrodensity Foam Zones enable you to apply varying amounts of pressure to massage and release tight muscles. At 13 inches long by five inches diameter, the compact Grid is highly portable and yet still able to support up to 500 pounds.The Grid is designed for athletes and people of all types and skill levels, from distance runners to professional athletes to yoga enthusiasts to those simply seeking to keep active. It's an ideal tool for massaging lats, quads, lower back, or any other large muscle group, or achieving a challenging core body workout.Features""Green"" technology:Constructed with less foam than traditional foam rollers Designed to withstand constant, heavy, and repeated use without breaking down Built from EVA foam Distrodensity Zones:Unique design allows for targeted massage Find the Distrodensity Zone that best suits your needs Distrodensity allows for a more realistic massage experience Core body workout versatility:Achieve a comprehensive core body workout Incorporate it into daily workout routines Compact design lets you travel with it and work out anywhereWarrantyThis Trigger Point Performance product includes a limited one-year manufacturer's warranty against defects in materials and workmanship.What are trigger points?Trigger points are tiny knots that develop in a muscle when it's injured or overworked, and are commonly a cause of most joint point. They've been known to lead to headaches, neck and jaw pain, lower back pain, tennis elbow, and carpal tunnel syndrome.Based on the discoveries of Drs. Janet Travell and David Simons, in which they found the causal relationship between chronic pain and its source, myofascial trigger point therapy is used to relieve muscular pain through stretching and applied pressure to trigger points. Trigger point therapy, such as that achieved using Trigger Point Performance products, can relieve muscular aches and pains in association with these areas. It can also assist with the redevelopment of muscles and restoration of motion to joints.Product DescriptionWhether you're an athlete, an exercise junkie, or simply looking to relieve muscle pain, step up your muscle recovery game with the TriggerPoint Grid 1.0 Foam Roller--your ultimate companion for enhanced muscle recovery and self-care. Experience improved muscle recovery with the patented multi-density GRID featuring a textured, 3-D design that promotes tissue aeration, enhancing the flow of blood, oxygen, and essential nutrients for efficient muscle repair. Say goodbye to soreness and stiffness with the unique foam construction featuring proprietary Distrodensity Zones, designed to target both tight, sore muscles and soft tissue for a personalized and effective recovery experience. This innovative design boasts varying ridges and nodules designed to replicate the sensation of a skilled massage therapist's hands, allowing you to self-target specific body parts and achieve deeper muscle massage. The EVA-foam-wrapped hollow core design with an open central space lets you deliver a firm compression akin to a sports massage, effectively releasing tight muscles, knots, and kinks. Built to withstand frequent massage sessions, the Grid 1.0 Foam Roller maintains its shape even after repeated use, ensuring you can perform the same roll-intensive recovery patterns that professional massage therapists use. Plus, with its low maintenance foam surface, sweat and dirt are easily wiped away, making it ready for immediate post-workout use when your muscles are primed for self-care. The 13"" long foam massage roller is the ideal balance between effectiveness and portability