ANTIBACTERIAL STOOL VINYL BLACK 8 WAY ADJUSTABLE ULTRA ADJUSTABLE SEATING ALLOWS PERSONALIZED POSITIONING FOR DAY-LONG COMFORT AND IMPROVED PRODUCTIVITY. EXTRA THICK 3-1/2"" PADDING FEATURES ANTI-MICROBIAL VINYL UPHOLSTERY THAT PROTECTS AGAINST MOLD AND GROWTH. WATERFALL CONTOURED DESIGN HELPS REDUCE STRESS ON YOUR KNEES AND IMPROVE LEG CIRCULATION. CONTOURED BACK PROVIDES LUMBAR SUPPORT. EXTRA LARGE 20""W X 19-1/2""D SEAT AND 19-1/2""W X 20""H BACK. POLISHED ALUMINUM BASE WITH 2"" DUAL WHEEL CARPET CASTERS PROVIDE EASY MOBILITY. 24-29 PNEUMATIC SEAT HEIGHT ADJUSTMENT. EASY ASSEMBLY. 1 YEAR LIMITED WARRANTY. ALSO AVAILABLE OPTIONAL STOOL GLIDES CAN REPLACE CASTERS FOR STATIONARY USE.