有人用过Semi-Dry Suit,也就是半干衣吗？

明年7月计划去新西兰玩，在kaikoura有个“Swimming With Dolphins”的项目我很感兴趣，就是和一群海豚一起浮潜，运气好还能碰到killer whale 。但7月那里是冬天，我发mail问了下组织这项活动的店，他们说这项活动全年都有，冬天那里的水温是10度左右，他们会准备Semi-Dry Suit和头套，手套，靴子。我google了下Semi-dry suits，结果如下：

Semi-dry suits are effectively a thick wetsuit with better-than-usual seals at wrist, neck and ankles. They are used typically where the water temperature is between 10 and 20 °C (50 and 68 °F). The seals limit the volume of water entering and leaving the suit. The wearer gets wet in a semi-dry suit but the water that enters is soon warmed up and does not leave the suit readily, so the wearer remains warm. The trapped layer of water does not add to the suit's insulating ability. Any residual water circulation past the seals still causes heat loss. But semi-dry suits are cheap and simple compared to dry suits. They are made from thick Neoprene, which provides good thermal protection. They lose buoyancy and thermal protection as the trapped gas bubbles in the Neoprene compress at depth. Semi-dry suits are made in various configurations including a single piece or two pieces, made of 'long johns' and a separate 'jacket'. Semi dry suits do not usually include boots or gloves, so a separate pair of neoprene insulating boots and gloves are worn.

感觉这东西就是件保温性好一点，密封性好点的湿衣啊，还是会有水进去的，就是进去少点而已。请问下磨坊的同学有谁用过吗？10度的水温用这个浮潜到底会不会冷啊？太冷我可受不了。