Isurus Men's Ti Alpha 6.5 Hooded Chest Zip Winter Wetsuit The latest 6.5 titanium-lined hooded winter wetsuit from the Isurus Alpha cold water wetsuits range. For those who dare to brave the most frigid oceans. Surfing has changed and so have the demands on your wetsuit. Never before have surfers pushed so deep into the wild North Pacific, Atlantic and even the Arctic regions looking for surf. The Ti Alpha 6.5 wetsuit is for those adventurous souls who are pushing the limits of the sport. Now with Yamamoto #40 (upgraded from #39), heat reflecting Titanium and super insulating Z-Fleece now covering 80% of the wetsuit, this wetsuit is the pinnacle of cold water protection combined with the flexibility of a traditional 5.4.