100% E3 Neoprene- The lightest, warmest and most flexible neoprene ever. The 3rd generation of Elastomax Superstretch Neoprene. Ultralight- Exceptionally durable and warm Neoprene with a soft hand feel. Stress Point Taped- Tape is added to the key stress points and junctions to increase strength and durability. Seamless Underarms & Shoulders- For unrestricted flexibility and maximum movement. Blue Steel Sealed Zip- A new and improved, water resistant, steel head zipper with engineered overlapping teeth and a urethane coating. Stash pocket- External zip pocket with key loop.