Air Relax Pro Leg Sleeves includes - A pair of leg sleeves (Main hose is not included)
6 Chambers - Offers anatomically more accurate layout/design.
Durable Garment - High quality 200 Denier Nylon Oxford, coated with 3 mil of polyurethane.
Internal Overlapped Design - No gaps between chambers. smooth chamber to chamber pressure transition. 
YKK Zippers - All of zippers come from YKK that makes the most dependable zipper in the industry. 
Medical Grade Silicone Hose - Non-toxic, lead-free. Tested for bio-compatibility and is appropriate to be used for medical applications and meet a high standards of manufacture, bio-compatibility and safety. 
 
Note: Air Relax Pro AR-4.0 is not compatible with AR-2.0 and AR-3.0.