Boys size 4 boots Used but in good condition FOR COLD TEMPS. Even when the temperature drops, these boots feature a Thermalfelt Plus removable liner for superior warmth down to -25°F. WATERPROOF DESIGN. Cemented and seam-sealed, this waterproof winter boot is made from ballistic nylon with leather overlays for premium water protection in the snow or rain. Cemented and seam-sealed,