NEO ballstretchers fit and feel fantastic. They have the same shape and thickness as traditional neoprene ballstretchers, but are made from our super-soft, stretchy Pure Platinum Silicone. NEO keeps the nuts down in the sack. All three models feature a thick lip at the edge to prevent them from digging into the sack. Unlike neoprene, NEO is rubbery, stretchy, and feels as if it is part of the sack. NEO ANGLE is a short ballstretcher with an angled lip that pushes your sack upwards and outwards. Material: Silicone, phthalate-free.