Rigid under the heel but flexible up front for stability on uneven terrain, the FlexForce 401 offers durability, comfort and lightweight versatility. Features include a rugged Red Wing Leather upper with advanced waterproofing technology, plus a Vibram® rubber/PU outsole underneath for best-in-class slip resistance. Advanced DynaForce® insole technology reduces underfoot pressure for all-day comfort.
- ASTM Standard: ASTM F2892-18, EH
 - Construction: Cement to Welt
 - Footbed: Nylon Covered Polyurethane
 - Height: 6-inch
 - Last: 156
 - Shank: Non-metallic
 - Leather Type: Full Grain, Waterproof
 - Insole: DynaForce®
 - Outsole: Vibram® Rubber-PU XClaim TC-4 Plus - Red
 - Waterproof: Red Wing Waterproofing
 - Resoleable: no
 - Country of Origin: Made in Vietnam