Find the perfect fit for you in the Calvin Klein Men's Size Guide. On this page you will find the exact measurements for our wide range of men's clothing, accessories and underwear. Our size guide has been carefully crafted with the item of clothing and its application in mind, ranging from loose fits in our nightwear range to tighter fits in our Calvin Klein Performance range. You can also find our detailed measuring instructions to help you get the most comfortable fit with every purchase. Find all the information you need to get the right fit with the Calvin Klein Men's Size Guide.