Although mainly used in warmer waters to keep the sun and wind off the skin, they can also be used as a second layer underneath your wetsuit. Thanks to the plush, wool-like Hot_Stuff lining, these tops have a luxurious texture that feels great, even on bare skin!The NEO TOPS have a more detailed and technical construction than that of the standard Rashguard, providing 100% UV protection, efficient heat retention and a reduction in irritations and bruising often caused by the harness or surfboard.