This V -neck vest has a minimalist design that makes it easy to wear as an inner layer , and the side zipper makes it easy to put on and take off . Made of recycled nylon and weft-dyed to create a chambray and metallic feel, the special wrinkle treatment gives it a three-dimensional feel. The fusion of the quilted back → non-brushed structure and Octa ® technology makes it an environmentally friendly and comfortable thermal material that is lightweight, absorbs water quickly, and retains heat .