Brand: AXESQUIN ELEMENTS Octa Lining Cardigan Color: Tetsukon (dark blue), Size: 1 This is an active insulation jacket from AXESQUIN ELEMENTS. It's light and fluffy. Comfortable to wear. Color: Tetsukon (dark blue), Size: 1 Fits like a women's M. Please refer to the last image for actual size measurements. The following is a quote from the manufacturer's description: Although it looks like a simple round-neck cardigan, it's a light and fluffy active insulation that combines a highly breathable shell with moderate insulation lining. Teijin Octa, a revolutionary polyester material, is about half the weight of polyester fibers of the same diameter. It not only quickly absorbs and disperses sweat through the hollow center of the fiber and the eight protrusions arranged radially on the surface, but also achieves heat insulation and heat retention by including a large amount of dead air in the space created by its unique shape. As active insulation, it provides moderate heat retention on mountain passes in cold seasons while releasing sweat, and as insulation, it is effective in preventing chilling from sweat during periods of inactivity when walking on old trails in warm seasons. If you slip it into the gaps in your backpack, you can use it all year round. Also, the neck is finished with a neat round neck, considering the possibility of layering. Synthetic fiber jacket AXESQUIN (Axesquin) ELEMENTS Octa Lining Cardigan AXESQUIN (Axesquin)