The size charts shown for each product show measurements for you to compare to your own body measurements. This means you do not need to add any additional 'buffer' to measurements to ensure your item will fit. Our garments are naturally a little bigger than the measurements on the size chart, and take into consideration wearing base layers. It's because of this reason that we recommend sizing down if you find yourself between sizes. You may also find your sizing with us is smaller than other brands, and this is due to the gross mis-sizing that is occurs with other brands. Your outerwear size with us should be close to the clothing you wear day to day.