BEVCO's ErgoLux Series advances the backless stool experience with the ultimate in comfort and durability. It is ideal for a wide range of applications, including general office, medical, laboratory, and higher education applications. The stress-relieving qualities of the stool are heightened because they respond to your body’s unique shape, weight, and temperature. The 3.5" thick ultrasoft, high-density, visco-elastic memory foam seat provides resilient, long-lasting ergonomic support. The 14.5" diameter seat is covered by puncture, water, and stain-resistant polyurethane that is non-slip and easy to clean. Easy-to-use pneumatic height adjustment allows you to change your seat height from 18" - 22.5". This stool comes with a sturdy 25" diameter black nylon base. Model comes standard with dual-wheel hard floor casters.