Brr.. Aspen keeps you warm with a maximum of 5/3mm neoprene. The added aquakiller thermo keeps the warmth where it belongs and helps the water wick away. Aspen is the thickest wetsuit in its range but still super flexible. Next to the fact that it simply looks good, it feels good due to a comfortable stitch construction and neoprene tape on the inside. Many features to prepare you on all different kinds of weather and water.