This is a preowned Professional's Choice Black OrthoSport All Around SMx® Air-Ride™ Saddle Pad that was only tried on a horse with a saddle.  The underside of the pad is clean, with just a few hairs in the fleece of the pad as shown in the photos.  The pad has been cleaned, but there is some dust from storage which still shows since the pad is black and difficult to get completely pristine.  The pad measures 30 inches across the back by 32 inches long which also makes it a great choice for All Around horses.

This pad combines the benefits of Professional's Choice's breathable and shock-absorbent SMx Air Ride material with OrthoSport features to create an unrivaled all around pad:  The SMx Air Ride™ is lightweight, highly breathable and shock-absorbent.  This pad is designed for riders who want a little more padding between their horse and saddle.  The heavy-duty 3/4 inch core allows even air circulation in every direction, resulting in accelerated heat dispersion and moisture evaporation.  The horse feels less heat and cools off faster, increasing overall performance.  SMx Air Ride™ All Around Pads feature a fleece lining that is easy to clean and dries quickly. 

The SMx  Air Ride™ Pads are constructed with a durable top that is densely woven to ensure longevity and to prevent saddle slippage.  This pad is also lined with high quality fleece which naturally wicks away moisture keeping your horse at a cool, comfortable body temperature.

• Breathable - Patented SMx Air Ride™ core allows air to circulate, resulting in accelerated heat and moisture evaporation so the horse feels less heat and cools off faster and maintains a cooler, more comfortable body temperature.
• Heavy-duty Core - Protects the horse's back from demanding types of riding. This SMx Air Ride™ Saddle Pad has a ¾ inch breathable core and durable woven upper.   These pads are appropriate for any western discipline.
• Shock Absorbent - The patented  Air Ride™  absorbs shock that could affect the performance of the horse.  Advanced technology deflects negative energy throughout the pad and away from the horse.
• Distributes Pressure - Unique 3/4" SMx Air Ride™ core evenly distributes weight from saddle and rider and prevents pressure points from forming, giving an even, comfortable ride.  Pressure Proof - The ¾” Air Ride™ core has been scientifically proven to absorb shock and disperse weight & pressure away from the horse’s body while protecting the rider’s back.
• Compression Resistant - Scientific testing under extremely hard use has proven it maintains its original thickness, resiliency and performance through years of rigorous use, outlasting and outperforming any other saddle pad on the market.
• Lightweight and Flexible - Designed to keep pressure off the spine and allow additional airflow along the horse's back.   The high performance felt lining conforms to the horse’s back, wicking away moisture, keeping your horse cool, comfortable and performing at it’s best.

I will leave feedback after receiving feedback from buyers as confirmation item has been received.