This is the Bare Men&';s SB System MID Layer Full Suit Drysuit Undergarment Features: High 4-way stretch fleece means garment is form-fitting and reduces bulk and lead weight requirements compared to nonstretch fleece undergarments High warmth-to-weight ratio delivers the exact warmth and breathability required for dive applications Includes moisture management technology that acts as the second stage in moisture movement away from the skin Incorporates quick drying characteristics for rapid evaporation keeping you dry and comfortable Includes anti-microbial properties that inhibit bacterial growth, keep the fabric fresh and provide odor control Front entry zipper offset at the neck to avoid bulk under neck seal Low profile thumb loops to assist donning Zippered stretch pocket laminated to left waist for key/ID Lycra stirrups keep pants in place when donning drysuit Flatseam stitching throughout One piece design for comfort Designed to be used as part of the SB System or as a stand alone garment Made from an advanced stretch breathable compression-resistant fleece, this one piece mid layer provides warmth without bulk. It also maintains insulating values at changing depths allowing the diver&';s core temperature to remain stable.