The SofTread Kit for H2X Trainer 15 Swim Spa comes with 9 grey/black pads that stick down on the flat surfaces of your swim spa. This exclusive nonslip comfort floor system by SwimDeck is now available as a upgrade. Safety while using your swim spa is of the utmost importance to Master Spas and we’ve literally got you covered with the SoftTread™, Nonslip, Comfort Floor System. Applied to each entry and exit step as well as the large floor area, safety and comfort are a given. The SoftTread™ Floor System grips each movement of your feet making exercises easier and more comfortable with the unique combination of traction and cushion. SoftTread is a trademark of Hyperform, Inc., dba SwimDek.