Tactical Research TR102 Men's MiniMil Ultra Light Black Boot Camping & Travel Luggage 4 in at 100 yds 197064578399 4 in at 100 yds Environmental Specifications Submersible to 45 m 150 ft Laser None Radioactive Material None Temperature Range Operation 45°C to + 71°C 49°F to + 160°F Temperature Range Storage 51°C to + 71°C 60°F to + 160°F Temperature Shock Operable after a temperature shock between 45°C and + 71°C 49°F and + 160°F Humidity Operable during and after Humidity Uses 500D Double rip Cordura® Fabric for the ultimate combination of strength and durability it still provides adequate protection from the elements with a padded achilles heel support and abrasion resistant nylon Cordura and leather A true minimalist boot with a 5 millimeter drop