Bask heated surface creates spa-like relaxation with soothing warmth on your back and neck Comfort Depth design offers a convenient 19 in. step-over height while retaining the same depth as a standard 21 in. bath Textured bottom surface Tile flange helps prevent water from seeping behind wall and simplifies alcove installation KOHLER ExoCrylic material offers 30% lighter product weight for easier installation compared to KOHLER Brand Acrylic FRP