Thermoforming and blow-molding are for kids. Kids toys like sliding sleds and cheap swimming pools. Step up to the rugged, real world of ice fishing. Making a durable sled with seamless surfaces and uniform thicknesses means roto-molding. The only way Otter makes a sled. Our processes meets strict tolerances, distribute more material in the corners to absorb shock and stresses where they occur most. When you're in the most extreme conditions. Recommended Optional Accessories: Sled Travel Cover (200017), Hyfax Runner Kit (200047), Sled Tow Hitch (200085), Hitch Pivot (200037), Rear Receiver Hitch (200064).