MY3425 Features: * Inflatable lumbar pump provides personalized back support while unique ""cut-out"" tailbone area helps reduce pressure on spine * Waterfall seat edge design relieves pressure behind knees to improve circulation * Height-adjustable arms with impact-resistant urethane armrests offer custom comfort for variety of users * Five-star base with casters for easy mobility * Casters supplied with chair may not be suitable for all floor types * Meets or exceeds ANSI/BIFMA standards * Dual-Wheel Hooded Casters Specifications: * 1-Pneumatic Seat height Adjustment, 11-Tilt Tension, 12-Tilt Lock, 13-Posture Lock, 2-Back Height Adjustment, 5-360 Swivel, 6-Tilt Assembly Instructions: * Extra assembly required Dimensions: * Back dimensions: 24"" H x 20"" W * Seat dimensions: 18"" - 22"" H x 20"" W x 19"" D * Overall dimensions: 40"" - 44"" H x 26"" W x 26"" D Warranty: * Manufacturer"s limited lifetime warranty