The O'Neill FLX Long Sleeve Crew is designed to be layered underneath an O'Neill FLX 3/2 short-sleeved wetsuit. It features wind-resistant sleeves made of the same smoothskin material as the FLX wetsuit, attached to a thin O'Neill Thermo top for convenient layering under a wetsuit. This is the perfect way to extend the cold water range of your short-sleeved FLX suit, or other short-sleeved spring wetsuit. The incredible versatility offered by the FLX Long Sleeve Crew makes it well worth the investment!