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Alera’s ergonomic design combines with high performance functions for all-day comfort. Multi-function mechanism allows back angle adjustment relative to seat, adjustable and forward tilt. Waterfall seat edge reduces pressure at the back of knees. Padded slant T-arms are height- and width-adjustable. Impact-resistant molded plastic shell. Five-star base with casters for easy mobility. Arm Adjustability: Height; Width; Arm Height From Seat: 7.13″ to 9.63″; Arm Type: Padded T-Bar; Armrest Color: Black; Armrest Material: Polyurethane; Arms Included: Yes; Asynchronous Control: Yes; Back Color: Black; Back Height Adjustment: Yes; Back Height Maximum: 27.95″; Back Height Minimum: 25.78″; Back Surface Material: 100% Polyester; Back Surface Material Family: Fabric; Back Width Maximum: 17.71″; Base/Frame Color: Black; Base/Frame Material(s): Steel; Caster/Glide Details: Five Dual-Wheel Casters; Caster/Glide Surface Texture: Hard; Color Family: Black; Distance Between Arms: 18.7″; Dual-Action Tilt: No; Dual-Clutch Posture Control: No; Integral Lumbar Support: No; Knee Tilt: No; Multi-Task Control: No; Overall Depth Maximum: 28.14″; Overall Depth Minimum: 21.25″; Overall Height Maximum: 47.44″; Overall Height Minimum: 41.33″; Overall Width Maximum: 28.34″; Pneumatic Seat Height Adjustment: Yes; Posture Lock: Yes; Recommended Application Area(s): General Office & Task; Specialty; Seat Color: Black; Seat Depth Maximum: 16.92″; Seat Glide Mechanism: Yes; Seat Height Maximum: 20.55″; Seat Height Minimum: 17.24″; Seat Surface Material: 100% Polyester; Seat Surface Material Family: Fabric; Seat Width Maximum: 19.29″; Synchronized Knee Tilt: No; Tilt Tension/Tilt Lock: Yes; Variable Synchro-Tilt: No; Weight Capacity: Supports Up to 300 lb Compliance Standards: CAL TB117-2013 Compliant; Meets or Exceeds ANSI/BIFMA Standards. Warranty: Manufacturer’s limited five-year warranty. Post-Consumer Recycled Content Percent: 0%. Pre-Consumer Recycled Content Percent: 0%.