The Syncro uses 100% FN Lite neoprene making it 16% lighter that comparable wetsuits. The Dry Flight Far-Infrared Heat thermal lining is used on the chest and back panels and retains body heat longer than ever. The Dry Flight lining wicks away water making this suit warm, light and quick drying! The women's Roxy Syncro 4/3mm incorporates 4mm neoprene in the chest and back to keep your core warm! The 3mm neoprene is used in the shoulders, legs and arms to maximize flexibility. Truly the women's Roxy Syncro is a fantastic multi-sport wetsuit and an unbeatable price. Excellent for Surfing, diving, wakeboarding, and more!