Spyder powergrade ski base layer infants the spyder powergrade ski baselayer top is ideal for youngster to wear in the cold to warm their upper body and help keep them insulated the top benefits from a high neck collar with half zip fastening for a comfortable secure fit the top features dryweb technology that helps draw sweat away from the skin and transport to the outer layer of the top ski base layer infants high neck collar half zip fastening dryweb technology