The next question was how would the product perform as a compression garment with stress being applied to the upper body. The weight on my shoulders had started to pull at around the 6 miles mark and I got that feeling I always get; it starts as a slight ache at the base of the neck and then radiates across the top of the shoulders, slowly but surely. A quick flex of the neck and shoulders tends to alleviate it for a while and it was not enough to really bother about. I was not used to the pack as that was being trailed as well and I had one or two issues with the straps being too far apart for my size, however, whereas before I had become irritated with it eventually, it almost felt like pressure was being applied across the whole shoulder rather than the point of contact. It is difficult to quantify the performance of the compression top, but it certainly seemed to "ease the load". After 8.5 miles I was back - 1 hour 25 mins mainly across rough ground, beach and pebbles apart from around 2 miles on roads. I kept the top on afterwards to see if it aided recovery, but it was hard to tell, the staff where I work were telling me to take a shower so I couldn't keep it on for long! So, first impressions, from a comfort and thermal control point of view, this stuff seems to be the business. I look forward to some more serious testing in the Sinai next month.