I used this once when diving at Silfra in Iceland. I believe the total usage time was about 2 hours. It's a rather expensive drysuit inner for its infrequent use, so how about this top and bottom set? World Dive Thermal Body Smoother Pullover (World Dive Drysuit Inner Thermal Body Smoother) Unisex Size L Product Specifications Drysuit inner wear made with fibers that excel in moisture permeability, water repellency, heat retention, and stretch. The surface repels water and blocks wind, while allowing moisture from the skin surface to escape. It also features a surface treatment that allows for smooth donning and doffing, providing a soft feel. The functional design with a 3D cut silhouette prioritizes ease of movement and comfort. The pullover allows for smooth donning and doffing with a front zipper, and the trousers have a high waist design to prevent the back from being exposed when sitting.