The original that started a barefoot revolution. From day one, the FiveFingers Classic has drawn the attention and praise of the press and active barefoot enthusiasts alike. This original design takes a casual and minimalist approach to barefooting. The upper features a thin stretch nylon fabric that fits low on the foot. Our non-marking 3.5mm ,TC1 performance rubber soles are razor-siped for flexibility and slip resistance over a variety of terrain. Materials: UPPER - abrasion-resistant stretch polyamide fabric SOLE - performance rubber FOOTBED - Antimicrobial microfiber Machine washable. Air dry. Weight: Men's size 43 - 5.3oz. each, 10.6oz./pair Place flat on the floor Hold heel tab and insert foot while aligning your toes with the five toe pockets Inch each toe into the appropriate pocket, make sure you have only one toe in each pocket before pulling up the heel. Gently tighten the elastic cord for added security. Pulling the cord too tightly could cause discomfort. If you plan to use your for activities involving swift water or deep mud, you may want to consider the KSO, SPRINT or FLOW models for a more secure fit during those activities.