The redesigned Psycho Tech is our most advanced boot, with an O'Ring entry and liquid-sealed Sidewinder seams for superior watertight performance. Our heat-retaining TB4 materials and rugged Krypto Armor enhance comfort, warmth, and durability while preventing overexpansion. A wrap-under arch segment pairs up with our high-performance All-Terrain Mudder Grip for improved stability. Built for the harshest conditions. Anatomical Fit Round-Toe for Increased Warmth Wrap Under Arch Foxing Segment for Improved Structure and Torsion Control Extended Foxing Coverage for Enhanced Durability and Grip Heel Lock Instep Strap Tapered Entry with O'Ring Seal Easy Entry Heel Pull Tab AT-Mudder Grip Sole for Slip-Free Performance Fluid Seam Weld with Fully TBX Taped Seams Shin: TechnoButter 4 Instep, Heel: TB4 Krypto Armor Firewall Sole: TB4 Firewall Multi-Layered Foxing PLUS (+) = 0.5mm Extra thickness for even more warmth | O'Neill Men's Psycho Tech 5mm+ Rt Booties in Black, Size 7