If you need extra warmth around your neck on cold dives, this is your option. A very comfortable superstretch neck seal that fits WP, SI TECH Neck Tite and Quick Neck. The seal is made of Yamamoto Superstretch 4000 Neoprene, in other words - top class. • Yamamoto Superstretch 4000 Neoprene. • Fits WP, SI TECH Neck Tite and Quick Neck. • Colour: Black • Available in 5 Sizes: XS-S, M-ML, L, XL-XXL, 3XL 30-33cm - XS-S 34-38cm - M-ML 39-43cm - L 44-47cm - XL-XXL 48-51cm - 3XL