What is the difference between short track speed skating safety pad and collision pad in ice rink?

What is the difference between short track speed skating safety pad and collision pad in ice rink? They are the same material, but their size and thickness are different. Rink protection pad rink collision pad short track speed skating protective pad - speed skating protective pad - rink protective pad (see picture). Short track speed skating is an Olympic event in Winter. The size of the competition field is 3060 meters. The length of each lap of the track is 111.12 meters. In 1992, short track speed skating was listed as an Olympic Event

2 a short track speed skating protective pads, involving a sport safety auxiliary device, the device is mainly composed of foam structure and layer, foam structure is composed of three different kinds of structure of the foam layer, the upper for open hole foam layer, the lower is closed-cell foam layer, the hole foam layer set between closed-cell foam layer and half open hole foam layer, porous layer thickness is greater than the half open hole foam layer, half open hole foam layer thickness is greater than the closed-cell foam layer, layer for cold resistant, waterproof, grinding material made of fabric layer, the fabric layer on the surface bubble structure. The utility model obviously improves the buffering effect on the impact force, and at the same time sets three foam layers with different structures, the open-hole foam layer, the closed-hole foam layer and the half-open foam layer have different elasticity, which greatly improves the rebound phenomenon of the protective pad and the safety protection performance of the protective pad.

3 a short track speed skating protection mat, size is 60 centimeters thick, high 126 cm, 239 cm long, is mainly composed of foam structure and layer, foam structure is composed of three different kinds of structure of the foam layer, the upper for open hole foam layer, thickness of 35 cm, base is closed-cell foam layer, thickness is 5 cm, in the open hole foam layer set between closed-cell foam layer and half open hole foam layer, half open hole foam layer thickness of 20 cm, layer for cold resistant, waterproof, grinding material layer made of fabric, the fabric surface layer of the bubble structure, fabric for medium density vinyl coating layer of polyester or * * * * * * - * * * * * * copolymer, A Velcro is arranged on the front, side and back of the short track speed skating protective mat. The Velcro on the front of the protective mat is 98 cm long and 20 cm wide. Nylon button on the side of the protective pad, measuring 100 cm long and 20 cm wide. The nylon clasp on the back of the protective cushion is 57 cm long and 20 cm wide. Short track speed skating is equipped with two non-slip handle the side of the protector, and measurement on the surface of a metal fittings used to connect the billboard, the back of the short track speed skating protection pad is equipped with upper and lower two belts, belts, set up several buckle, belt, to use the ultimate strength of not less than 6 kn heavy duty security material, short track speed skating protective mat at the back of the upper is equipped with two handles, short track speed skating around the back of the protective pads edges have a zipper and to install the foam structure.