The Wool Button In Liner is made of 100% Australian Wool to keep you warm in harsh weather. The liner pairs with three different Oilskin jacket styles. This liner is a button up liner with a length of approximately 31" for a small which grades up 1.5" each size to a XL and then it grades 1" for every size after that. The grading is the same throughout all of the measurements. The open chest starts at about 48" (S) and the chest is 22.5" (S). Please call customer service if you have any questions regarding sizing for this item. Over the last 25 years, the Outback name has come to mean fine oilskin apparel. Using premium Australian oilskin fabric and skillful craftsmanship developed over more than two decades, we offer the best waterproof oilskin apparel for working western lifestyles, traditional English equestrian pursuits and casual country wear. We're proud of our Outback brand and what it means: superior materials and workmanship, authentic styles and new ideas, rugged details and components designed to head off foul weather ahead.