Vinyl ACTIVE LEARNING STOOL: Designed to turn active bodies into active minds, making it a innovative and fun seating solution for individual desk work or productive group environments STAY FOCUSED IN MOTION: Sturdy nonslip curved base supports up to 265 lbs. and naturally allows for a slight rocking motion so when energy hits, you can stay focused on your assignments ENCOURAGES PROPER POSTURE: 12.625" wide, foam-padded seat provides superior comfort, and the backless design encourages proper posture while strengthening core muscles just by sitting HEIGHT-ADJUSTABLE: Seat height can be adjusted from 18.5" to 28" by toggling the easy-to-use pneumatic gas lift to accommodate users of all shapes and sizes DURABLE AND LIGHTWEIGHT: Heavy-duty polypropylene frame and vinyl-covered foam seat are easy to clean, and the lightweight design provides easy mobility around the classroom or office and compact storage after use