This video teaches how to increase the surface area of the support under your tripod by using snow shoes. You can get snow shoes from various manufacturers. The bottom of the snow shoe has a very wide surface area. You can compare this with the width of the tripod base. The snow shoe makes the tripod more stable on the ground when you are using it on mud or snow or on sand. The snow shoe stops your tripod from sinking into the ground. On top of the snow shoe, you have a little rubber strap and a clamp-like provision using which you can fit the leg of your tripod with the snow shoe. If you don't have the rubber strap, you can use any elastic material to hold the tripod leg. The tutor then demonstrates how the snow shoe is used with the tripod. He also explains how to take off the snow shoe and put it back on to the tripod.