Neoprene Long Sleeve TopThis product provides a fantastic layer of extra warmth and insulation when swimming outdoors or doing other watersports. Having tested many of the existing products on the market Zone3 felt that it was necessary to add the back zip otherwise its almost impossible to take this close fitting style top off. The base layer is made from Yamamoto Smoothskin neoprene with a 1. 5mm thickness which offers a high level of flexibility and movement. The top is