The Immersion Research Neo Guide Short features a 1mil neoprene liner sewn in and a high 3mm neoprene upper waistband to keep shorts snug against lower back and prevent chaffing against a back-band. Perfect for cooler paddling days or when you need a little insulation from cold water. The outer fabric is an abrasion-resistant 100% nylon fabric. Gusseted crotch provides ample room while seated. Side zip pocket with an integrated clip-able bungee keeps items secure and out of the way. Cozy 1mm above the knee neoprene liner adds warmth for another layer of protection from the elements.