Muck Men's Muckster Lite Black EVA Clogs Size 13. Textured insole for comfort, grip and support. One piece bio lite EVA. Lightweight and easy to slip on/off. Easy-to-clean/hand washable/quick drying material. Breathable side ports for water drainage and comfort. 100% water-friendly, 100% muckproof. SRC rated for excellent multi-surface slip resistance. Biodegradable - up to 3 years in accommodating environment. Eco-friendlier bio lite outsole is lightweight, durable, and provides SRC rated slip-resistance. Landfill biodegradation validated utilizing the ASTM d5511-18 test method, iso 15985. Customers recommend ordering one size smaller than their regular size.