Customers recommend ordering one size smaller than their regular size Textured Insole for Comfort, Grip and Support One Piece Bio Lite EVA ASTM D5511-18 / ISO 15985-14 Lightweight and Easy to Slip On/Off Introducing an innovative one-piece clog from The Original Muck Boot Co. Inspired by the Muckster collection, the Muckster Lite Clog is 50-percent lighter, offers independently verified SRC rated slip-resistant traction and provides excellent support and comfort for all-day wear. The Muckster Lite Clog is built from a high-performance, lightweight foam called Bio Lite which is ultra-durable and easy to clean. The upper features side ventilation holes for breathability and drainage for water and debris. The entire clog is constructed from Bio Lite which is than many other injection Shaped foams in the market. Bio Lite has been granted a Green Leaf certificate by Intertek, an accredited independent 3rd party testing facility, verifying that this product will properly degrade in . landfills. Landfill biodegradation validated utilizing the ASTM D5511-18 test method, ISO 15985. The Muckster Lite offers a lighter footprint for your feet and the planet.