561 High Leg Zipsider Boot W/Scuff Cap - Wheat. The 561 is our toughest boot, designed with a higher cut for added coverage and manufactured with a full leather upper. Bearing the mighty Vibram® sole, this boot can withstand temperatures up to 300℃. The exterior may be fortified but look no further for comfort as the interior of the boot includes the OrthoTec Poron® footbed...