Snowboards and splitboards having a contact length less than or equal to 65% of the length of the snowboard or a contact length equal to or less than half the length of the snowboard are disclosed. In some embodiments, a peak of a cambered section is aligned with a horizontal midline of the snowboard. In other embodiments, a peak of a cambered section is aft of a horizontal midline of the snowboard. Optional features of the snowboards and splitboards include bi-lobed tips, bi-lobed tails, touring tails and/or dual recurved tails.

The invention relates to a ski, including: a paddle region which forms a front end of the ski; a rear end region; and a binding region, which extends in the longitudinal direction of the ski between the paddle region and the rear end region, for fastening a ski binding; a core; an upper strap; a lower strap; and a reinforcing frame which extends in the paddle region and/or in the rear end region.

The invention relates to a ski, including: a paddle region which forms a front end of the ski; a rear end region; and a binding region, which extends in the longitudinal direction of the ski between the paddle region and the rear end region, for fastening a ski binding; a core; an upper strap; a lower strap; and a reinforcing frame which extends in the paddle region and/or in the rear end region.

A foam product includes a foam core, an upper skin and a lower skin. The foam core has a top surface, a bottom surface, and a peripheral side surface. The upper skin covers both of the top surface and the peripheral side surface of the foam core, but extending not beyond the bottom surface of the foam core. And, the lower skin covers both of the bottom surface of the foam core and a peripheral end surface of the upper skin.

A foam product includes a foam core, an upper skin and a lower skin. The foam core has a top surface, a bottom surface, and a peripheral side surface. The upper skin covers both of the top surface and the peripheral side surface of the foam core, but extending not beyond the bottom surface of the foam core. And, the lower skin covers both of the bottom surface of the foam core and a peripheral end surface of the upper skin.

A ski includes an elongate core and a fiber reinforced composite layer disposed over the elongate core. The fiber reinforced composite layer has a first plurality of fibers fixed in a resin and a second plurality of fibers fixed in the resin. The first plurality of fibers extend along a first arcuate path from a left side of the ski to a right side of the ski such that the angle of the first fibers with respect to the centerline increases from the left side to the right side. The second plurality of fibers extend along a second arcuate path from the right side of the ski to the left side of the ski such that the angle of the second fibers with respect to the centerline increases from the right side to the left side. In some embodiments the first and second plurality of fibers are symmetrically positioned in the composite layer.

A ski includes an elongate core and a fiber reinforced composite layer disposed over the elongate core. The fiber reinforced composite layer has a first plurality of fibers fixed in a resin and a second plurality of fibers fixed in the resin. The first plurality of fibers extend along a first arcuate path from a left side of the ski to a right side of the ski such that the angle of the first fibers with respect to the centerline increases from the left side to the right side. The second plurality of fibers extend along a second arcuate path from the right side of the ski to the left side of the ski such that the angle of the second fibers with respect to the centerline increases from the right side to the left side. In some embodiments the first and second plurality of fibers are symmetrically positioned in the composite layer.

Systems and methods are provided for generating a design for a gliding board. The methods involve operating a processor to: define a desired carved turn of the gliding board; define a desired global curvature profile; generate a desired deformed shape of the gliding board during the desired carved turn; generate a sidecut profile of the gliding board; generate a width profile of the gliding board; generate a camber profile of the gliding board; generate at least one stiffness design variable profile; generate a total load profile; modify at least the width profile, the sidecut profile and at least one of the at least one stiffness design variable profile at least once; and define the design for the gliding board based at least on the width profile, the camber profile, and the at least one stiffness design variable profile.

Systems and methods are provided for generating a design for a gliding board. The methods involve operating a processor to: define a desired carved turn of the gliding board; define a desired global curvature profile; generate a desired deformed shape of the gliding board during the desired carved turn; generate a sidecut profile of the gliding board; generate a width profile of the gliding board; generate a camber profile of the gliding board; generate at least one stiffness design variable profile; generate a total load profile; modify at least the width profile, the sidecut profile and at least one of the at least one stiffness design variable profile at least once; and define the design for the gliding board based at least on the width profile, the camber profile, and the at least one stiffness design variable profile.

Provided are a sliding instrument having a low frictional resistance to the snow surface, the ice surface, or the water surface and having excellent sliding performance and a method for manufacturing the sliding instrument. A sliding instrument to slide on snow, ice, or water includes a sliding surface (1) to come into contact with the snow surface, the ice surface, or the water surface, and the sliding surface (1) has a surface roughness Ra of 1.0 m or less. A method for manufacturing the sliding instrument includes polishing a sliding surface (1) using a polishing composition slurry containing abrasives to make the sliding surface (1) have a surface roughness Ra of 1.0 m or less.