Comfort Foam Shower Mat with Offset Drain Hole - White 23 Diameter. Generous shower stall coverage. Offset drain hole and perforated pattern drains water to prevent pooling. 24 strong, low profile suction cups connect to non-textured shower surfaces for reliable slip-resistance. High-quality, machine washable PVC foam feels great underfoot. High-quality, machine washable PVC foam feels great underfoot.