1. A towed elongated platform haviNg a forward end, towable by a snowmobile in a forward direction in relation to its length and steerable by a person standing thereon comprising hitch means attached to said forward end for attachment to said snowmobile, an upper wall, a lower wall, a side wall connecting said upper and lower wall, said lower wall having a central planar portion curving upwards towards said side wall, a pair of spaced apart side ribs diverging in the direction of travel of said platform, a spaced apart central rib intermediate of said spaced apart side ribs and extending lengthwise of the lower wall along said planar and curved surface, said central rib terminating ahead of said side ribs, the surface of said central rib being lower than said side ribs when the upper wall of said platform is horizontal, said upper wall having a pair of spaced apart sockets positioned above said curved surface of said lower wall and adapted to receive the feet of said person, said sockets being one to the outward side of each of said side ribs and intermediate the ends thereof.