Shield 3.3 Zip free FullsuitIsurus Men's Shield 3. 3mm Zip free Fullsuit Wetsuit The 3. 3 zipfree wetsuit from the Isurus Shield range. For those who want a little more warmth than the Shield 2. 2 Zipfree wetsuit. The Shield 3. 3 Zipfree wetsuit gives you 4 mm warmth in a 3 mm wetsuit. It is just better surfing in a thinner, warmer wetsuit. The same Arms Up Design Zero Shoulder Restriction paddling as the Shield 2. 2. But with an extra mm of warmth. Giving you 4 mm warmth in a 3