Muck Boot Pursuit Fieldrunner 15" Rubber Insulated Men's Hunting Boot Synthetic Synthetic sole Shaft measures approximately 13" from arch Boot opening measures approximately 15.25" around 5 mm neoprene provides comfort and flexibility, along with excellent waterproofing, shock absorption and heat retention properties; adjusts to your foot shape to resist blisters and chafing Abrasion-resistant Spandura upper protects against thorns, sharp branches, rock scrapes and other outdoor perils; angled topline improves movement for walking and bending; pull loops for easy on/off Fleece lining is soft, durable and provides exceptional warmth in frigid environments; etc Sockliner reduces underfoot friction and heat build-up; comfort rated from -20 F to 50 F (-30 C to 10 C) Optimal flex points for ease of movement; resilient forefoot stability cage for comfortable sure footing on rough, rocky ground High-grade rubber provides extra toughness and makes for a 100% waterproof hunting boot; wide-tracking waffle outsole for superior traction on tree stand grates