Fits AP16 Kneepads ONLY. Easily replace your damaged white boots to keep your AP16 kneepads performing at their best. ProKnee's AP16 White Boots are now made from a super tough thermoplastic resin with proven results that these boots perform equivalent, if not better than their former rubber boot predecessor. This durable non-skid, non-marking material stands up against your toughest of jobsites.