Cirrus puffer vest size

Cirrus puffer vest, army green,made in Canada , mount Washington label,no size label but measures S. zip side pockets, Velcro adjustable hem, tab for keys or snow pass, nylon/polyester blend, mended tear(maybe where tag was) on inside seam( see pics) doesn’t affect overall look or functionality. Lightweight, thinner puffer, great for layering, hiking , camping, adventure