BEST IN CLASS FABRIC: The Monster Ultimate chair has a breathable nylon-spandex fabric that permits airflow and provides cool and comfortable seating, better air circulation and reduced heat build-up, making it more breathable and pleasant than a leather chair. TECH SPECIFICATIONS: INTERNAL FRAME MATERIAL: Metal ? Frame Size: Large ? UPHOLSTERY Material: Spandex Fabric + PU Leather ? Neck/Head Pillow: Yes (Velour Material) ? Lumbar Pillow: Yes (Made of Memory Foam & UPHOLSTERY - Velour Material) ? Foam Type: Seat made of Molded Foam ? Color: Black & Grey INCLUDES: Mechanism Type: Newly Engineered Frog Mechanism ? Any Position Lock Available: Yes ? Rocking Range: Approx. 15 Degree ? Adjustable Backrest Angle: 90-180 Degrees ? Gas Lift: Class 4 ? Base: Heavy Duty Metal Base ? Caster Wheel Size: 60mm Dual Caster Wheels ? Suitable for Height:- 5ft.8" to 6ft.5" (172-196cms)