The 15" spike-down base combines the exclusive Soft Touch base design with a spike-down mounting system that can be installed on any grass or dirt area. Use this base on any field when square Soft Touch ground anchors are not present. Simply drive the spikes through the yellow "T" mounting anchor and quickly mount the base the the anchor. Soft Touch bases flex and absorb energy as a player slides into the base. In the case of uncontrolled slides, the "Progressive Release" action allows the base to flex until enough force is applied to "pop" the base free from the mount, making them much safer than stationary bases.