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