This is the Bare SB System Men&';s Mid Layer Top Fleece Breathable and Compression Resistant Features: High 4-way stretch fleece means garment is form-fitting and reduces bulk and lead weight requirements compared to non-stretch 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 Flatseam stitching throughout Two piece design allows the diver to mix and match sizes of top and pant for perfect fit Designed to be used as part of the SB System or as stand alone garments Pull-over design has no bulky closures that restrict stretch Molded comfort collar reduces neck chafing Zippered stretch pocket at right upper arm for key/ID Low profile thumb loops to assist donning Lower body constructed of lighter weight fabric to reduce bulk when tucked in Made from an advanced stretch breathable compression-resistant fleece, this two piece mid layer provides warmth without bulk. It also maintains insulating values at changing depths allowing the diver&';s core temperature to remain stable.