Wearable air conditioning! The fabric of the Mens Barrel Shirt from Jack Wolfskin has tiny perforations in it which make it very light and airy. The fabric is so thin that if you hold it up to the light you can practically see through it. Despite this, it is very hard wearing. It's stretchy, too, so you get the freedom of movement you need on your summer travels. The shirt is also fast drying and has stay-fresh properties–two more reasons why you'll love it.