EvoGrips | Arm Building Barbell Grips (Black) EvoGrips are designed to increase grip strength, improve comfort, and activate neglected muscles. These fitness accessories alter the position of the user's hand in a way that distributes force to the natural shape of the human grip. This simple alteration allows the user to utilize their natural gripping power during exercise. Be ready for some serious arm pump. Get more out of your workout. Gives any compatible bar an EZ-Style Grip! Fits most Standard and Olympic sized bars.