The MR52 offers Mares legendary performance in a compact design with two exclusive Dynamic Flow Control (DFC) ports, improved HP hose placement and a Natural Convection Channel (NCC) for cold water performance. The Instinct second stage is wedge shaped for improved hydrodynamic performance in a variety of diving environments. Features: Comfortable ergo dynamic design Extremely light weight Compact size Easy to use purge Side exhaust eliminating bubbles in front of the face Style 416229