Caterpillar Everett S3 Safety Boot The Everett S3 is a non-metallic waterproof safety boot that offers cold insulation up minus seventeen degrees. Fastening:Lace Up Material Composition:Leather/Other Materials/Other MaterialsCare Instructions:N/A Thinsulate lined for cold insulation that can resist up to -17 degrees. Waterproof, full grain leather upper keeps feet dry and protected, and provides long-term durability. Tough and durable rubber outsole that provides excellent grip. Composite toe: same great protection but non-metallic and lighter than traditional steel. Energy absorption, puncture resistant and with a heat resistant outsole. Non-metallic: ideal for those working in aviation. Molded TPU scuff cap and heel guard for enhanced protection. Molded EVA midsole offers additional shock absorption and all-day comfort. Antistatic.