Unequal Solo™ - $49.95. The Solo is a concealed, supplemental head padding to protect against high speed collisions, wild pitches, slashing sticks and dangerous wipeouts that come with the territory. This ultra thin helmet insert is made with a military grade composite fortified with Accelleron® and TriDur™. Simply Place-n-Play Solo into virtually any action, baseball, hockey or lacrosse helmet. Use of this lightweight, comfortable liner predicts a lower risk of injury.