Proactive Medical Products Sit-to-Stand Knee Strap/Brace, Item Number 31230. This heavy-duty medical sling strap is designed to assist with patient transfer and stability during sit-to-stand movements. Featuring durable blue nylon and high-grade canvas construction, it is built for safety and daily clinical use. Included in this listing is the knee strap and buttock strap as shown in the original manufacturer packaging. This item is brand new, still in the original box and internal sealed plastic. Made with professional-grade materials for maximum durability.