SAFETY: Light, non-metallic, asymmetrical composite safety-toes meet ASTM F2412-11 I/75 and C/75 Impact Compression Standards Design: Water-Resistant, with breathable mesh vents to provide airflow Tough 1/4 inch rubber outsole protects the bottom of the shoe and features 6mm lugs for aggressive grip and flex grooves for agile mobility Dynamic cushioning, with EVA mid-sole and arch-support Insoles Additional Details: Fit & Sizing: X1 Boots fit a bit small because of the composite toe, manufacturer recommends ordering up a 1/2 size larger