With a chest zip entry and liquid taped seams this is a great Winter suit. Dry Flight infrared heat technology thermal lining retains body heat by conducting it back into the lining. The neoprene is F'N Lite which is really lightweight and warm.  Features: Entry: chest zip Thickness: 5/4/3mm F'N Lite neoprene: this neoprene is packed with air cells for the lightest of lightweight warmth Dry Flight far infrared heat technology thermal lining retains body heat by conducting it back into the lining LFS seams: a stretchy, flexible liquid tape that seals GBS stitched seams. LFS refuses to leak. PK #8 Chest Zip: Gets the zipper off your back, increasing warmth and flexibility Hydrowrap Adjustable Neck Closure: Completely adjustable neck closure system that creates a secure & watertight seal Thermal Smoothie Neoprene: Wind & water repellent whilst remaining more flexible than ever Ecto-Flex Knee pads: Durable, lightweight and flexible outer knee pads that protect you and your board Glideskin Neck Seal: Ultra smooth neoprene liner for superior comfort along with a watertight seal Internal key pocket that keeps your keys safe and sound Suitable for water temperatures of 8 - 13°C/46 - 55°F