Thank you for viewing. The item was purchased new in 2025 (the tags were discarded at the time of purchase). It is a completely unused item that has never been used. I am selling it because I have no plans to use it. I highly recommend it to those who enjoy mountain climbing and camping. Product Information This is an auto-inflating 4-season mattress with excellent cost performance. It has a comfortable 5cm thickness when in use. This season, it has been updated to a solid foam for increased stability. It inflates smoothly when the valve is opened. ■ Included: Stuff sack ■ Size: 51 x 183cm ■ Storage size: 54 x 18cm ■ Weight: Approximately 1140g ■ Material: 75D polyester ■ Thickness: 5cm ■ R-value: 6.0 Important Notes I am sorry, but I am not currently accepting requests for price reductions. I may make adjustments depending on the situation. Please refrain from purchasing if you are overly concerned about the quality. If you are satisfied, please consider purchasing.