THE EVERLAST SERIES IS SPECIFICALLY DESIGNED FOR OUTSTANDING COMFORT AND LONG-LASTING USE IN THE TOUGHEST ENVIRONMENTS. THESE DURABLE CHAIRS OFFER TOTAL BODY SUPPORT WITH ADVANCED ERGONOMIC FEATURES THAT IMPROVE PRODUCTIVITY AND REDUCE FATIGUE. BEVCO'S® EVERLAST ISO 4 CLEANROOM CHAIRS ARE SPECIFICALLY DESIGNED FOR OUTSTANDING COMFORT AND LONG-LASTING USE IN THE TOUGHEST WORK ENVIRONMENT MEETING THE PARTICULATE GOALS OF ISO 14644-1 AND HAVE BEEN TESTED BY AN INDEPENDENT LABORATORY TO CERTIFY ISO 4 COMPLIANCE. THE BLACK POLYURETHANE SEAT AND BACK ARE IMPERVIOUS TO WATER OIL AND MOST CHEMICALS AND ARE PUNCTURE RESISTANT AND EASY TO CLEAN. THIS ARTICULATING TILT MODEL FEATURES SIMULTANEOUS SEAT AND BACK ADJUSTMENTS TO PROPERLY POSITION THE ANGLE OF THE CHAIR FOR INCREASED COMFORT DURING EXTENDED SITTING DURATIONS. THE CONTOURED BACK IS FULLY ADJUSTABLE ENCOURAGING PROPER SPINAL ALIGNMENT WHILE THE CONVENIENT HANDLE MAKES MOVING THE CHAIR EFFORTLESS. THE WATERFALL SEAT AIDS IN LOWER BODY CIRCULATION IMPROVING OVERALL WELLNESS. THE PNEUMATIC HEIGHT ADJUSTMENT ALLOWS YOU TO EASILY CHANGE YOUR SEAT HEIGHT FROM 21"" - 31"". THIS CHAIR COMES WITH A STURDY 27"" DIAMETER BLACK NYLON BASE AND ADJUSTABLE CHROME FOOTRING. MODEL COMES STANDARD WITH MUSHROOM GLIDES. NON-SLIP ANTIBACTERIAL POLYURETHANE CHAIR RUGGED SELF-SKINNED POLYURETHANE RESISTS STAINS AND DAMAGE FROM PUNCTURES GREASE WATER AND MOST CHEMICALS. THE VENTILATION RIBS INCREASE AIR CIRCULATION AND YOUR COMFORT. THE EVERLAST SERIES IS THE LEADING CHOICE OF MANUFACTURING HEALTHCARE AND HIGHER EDUCATION INSTITUTIONS. FEATURES UL STYLE""MARGIN-TOP0PX; PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" HEAVY-DUTY CONSTRUCTION THAT CONTRIBUTES TO YEARS OF LONG-LASTING SATISFACTION A HIGH PERFORMANCE ADJUSTABLE 18"" CHROME FOOTRING IS STANDARD ON MID AND TALL HEIGHT MODELS SEAT 18-1/2"" W X 17"" D X 1-1/2"" THICK BACK DIMENSION 16-1/2"" W X 12-1/2"" H X 1"" THICK MEETS GREENGUARD GOLD/ ANSI/ BIFMA STANDARDS SWIVEL 360°