I just bought this at Shimamura on October 31st. My child has sensitive skin, and I mistakenly bought this thinking it was 100% cotton, so I'd like to sell it to someone at a lower price. It's a new, unused item, but I did open the package, so please refrain from purchasing if you are concerned. FIBER HEAT, size 160, set of 2 short-sleeved shirts, made with heat-retaining material and treated for odor control. - Brand: FIBER HEAT - Size: 160 - Type: Short-sleeved - Quantity: Set of 2 - Features: Made with heat-retaining material - Odor Control: Odor control treatment Thank you for looking.