Thank you for viewing. I purchased this around the summer of this year, but I haven't used it much and have been storing it at home. There are no noticeable stains, but please understand that this is a used item and refrain from purchasing if you are sensitive to such things. For those concerned about their lower back. The stable structure of a horse saddle! From the popular horse gear series, with over 20 units sold, the Magu Mat Premium has been upgraded☆ By reproducing the stable structure of a horse saddle in the mat, you can sit with good posture, for long periods, stably, and comfortably! Of course, the shape of the seat surface, as well as the stability, softness, and hold, are all incorporated into the 3-layer structure! Furthermore, the lumbar support arch and round shape of the backrest allow you to firmly support the area around your lumbar spine when sitting. By bringing together the wisdom and skills of three artisans, this is truly a one-of-a-kind, made-in-Japan mat! Developed over approximately two years, bringing together the wisdom and skills of three artisans, with the concept (goal) of sitting comfortably, stably, and with good posture for long periods. ■ Brand: PROIDEA ■ Product Name: Magu Mat Premium EX ■ Color: Brown ■ Size: 41 x 33 x 30cm ■ Weight: Approximately 1189g ■ Materials: Core material: Polypropylene, Cushioning material: Polyurethane, Cover: Polyester, Non-slip material: Acrylic resin ■ Weight Capacity: 100kg Reference price: 11,000 yen