Amazon.com | BOGS Slate Mid CT Black 7 D (M) | Industrial 。BLOOM eco-friendly, algae-based EVA footbed that helps clean polluted water habitats. Rebound cushioning in the midsole provides all-day comfort and energy return. DuraFresh natural bio-technology activates to fight odors. Asymmetric composite toes custom built for each size that meet ASTM standards. BioGrip outsole designed with maximum surface area for slip resistance. Breathable textile upper for temperature regulation. 46.4% Textile / 34.7% TPU / 18.9% Leather Lace up closure 2\" heel 5\" shaft Round Composite Toe - ASTM standard Algae EVA Footbed Bio Grip Rubber outsole