dry suit
noun
a close-fitting, double-layered synthetic garment worn by a scuba diver in especially cold water, protecting the skin from contact with water and having an internal, warming layer of air that can be added to in order to equalize pressure during descent.
Origin of dry suit
First recorded in 1950–55
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019