IMPACTO® INDUSTRIAL COMPRESSION SOCKS. Moderate graduated compression of 15-20 mmHg for quicker blood return and improved performance. Nylon 75%, Spandex 13%, Polyester 12%. Seamless toe, soft comfortable welt without restriction. Ventilated foot for breathability and arch support. Cushioned in the Achilles tendon area for better protection and comfort. Reciprocated heel and toe for outstanding fit and comfort. Designed to help performance during activity or competition. For high performance work and athletic wear. Provides support for long term standing on concrete floors.