Engineered for maximum comfort and support, CONSTRUCTOR (STP) features Baffin's most aggressive inner boot system. Built with non-metallic construction, CONSTRUCTOR (STP)'s versatile application recommendations and maximum durability make this an essential boot for long days on the job. Non-metallic construction CSA/ASTM Approved ESR/EH Rated Upper: Oil and acid resistant Neoprene and leather upper, laces and stitching High-visibility reflective overlay Pull loop at the back for ease of entry Base: Composite Safety Toe and Plate Oil and acid resistant rubber outsole Lightweight Polyurethane (PU) base for effective use at extreme freezing temperatures GelFlex anti-fatigue midsole for shock absorption and rebounding Fixed frost plate returns heat and reflects cold for temperature regulation Multi-directional lug design for added slip resistance in snow Tested in accordance to Z195-14 for Coeffiency of Friction (COF) on Quarry tile/stainless steel/wet and dry surfaces, at room temperature and cold climate conditions Insulation: Removable Comfort-Fit multi-layer inner boot system featuring: Thermaplush™ soft, next-to-foot wicking layer for warmth Form-fitting B-Tek™ Foam lining for comfort Double B-Tek™ Heat lightweight, 4-channel hollow-fibre insulation for high-loft breathability in a broad range of temperatures Vapourized Aluminum Membrane for energy reflection and heat regulation PolyWool polyester wool blend for breathable warmth Hydromax™ layering for improved moisture management Diamond Net insulation for wind-resistant protection with a lightweight feel Waffle-comb footbed designed to trap warm air and control odour Double aluminum insole returns heat and reflects cold for temperature regulation