The streamlined Pure BCD offers swivel shoulder buckles, smart trim weight positioning and maximum adjustability. A great BC! Great for travel. The Mares Pure SLS BCD is a giant step in the evolution of back mounted BCDs. The first thing you will notice when donning the Pure SLS BCD is the perfect fit. This new level of comfort is achieved via special shoulder pads which are longer, pre-shaped and reinforced, and which work in perfect unison with the lumbar suspension system. This suspension system is inspired by the design of modern hiking backpacks; the system avoids direct contact between the body and the tank support. Pure SLS BCD features 7 stainless steel D-rings for complete accessory attachment. Made of very tough 420 Cordura material, it will endure any exposure you submit it to and hold up to the test of time.