AFS-TEX Active Anti-Fatigue mats are designed to provide the ultimate standing surfaces combining prolonged comfort and effective body support. Reduces the strain on feet, legs knees & back joints that can be caused through prolonged standing. The AFS-TEX 4000X provides a contoured, non-linear ergonomic surface specifically designed for use with standing and height adjustable desks. Contains anti-microbial content to protect the mat surface from microbial deterioration. Effective 24/7 for the life of the product. Anti-slip base for stability. Non-toxic and phthalate free. Ideal for office or home use. Features: Ergonomically designed specifically for use with standing desks. The contoured, non-linear surface encourages regular movement and the changes in standing positions which significantly reduces fatigue Raised ergonomic surround feature allows further rocking or stretching of feet and ankles. Such activity stimulates blood flow and increase the body's metabolism which can reduce fatigue Ergo bar and rear recess enable ankle flex exercise for added stimulation.