Thank you for viewing the TERNUA knit cap. I purchased this about three years ago at Ishii Sports, a mountaineering specialty store. I bought it for winter mountaineering. I intended to wear it under a helmet, but the knit cap's fabric is thick, making it too tight to wear with a helmet, so I didn't use it and kept it in storage. I've tried it on at home, but I haven't used it for mountain climbing. ① The black part on the inside is fleece fabric. ② Material: 50% Wool 50% Acrylic ③ Made in Poland Feel free to comment. I look forward to hearing from you.