This is a men's heko obi (soft sash) set. I believe both are polyester, but I'm not certain as I don't have detailed knowledge. They can be worn, but are recommended for repurposing. Navy blue: Width: Approximately 64cm, Length: Approximately 340cm Black: Width: Approximately 70cm, Length: Approximately 320cm These items have been stored at home. There may be overlooked scratches, old marks, stains, or odors. Please check the images and consider before purchasing. Simple cleaning has been done, but some stains may remain. Please note that perfect cleaning has not been performed. Also, the items will be shipped without the box. Please be aware of this. ◆ Immediate purchase OK. ◆ All items are free shipping & shipped quickly. ◆ In the unlikely event of a product difference or size difference due to our error, we will provide a full refund, including return shipping costs, so please rest assured. 【Management Number】