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The Dart Thermo is new from Montane this season. The fibre combination of nylon and spandex gives this fabric a denser feeling than polyester and a surprising degree of warmth given the low garment weight. It's close-fitting without being spray- on and has four-way stretch although less than I expected given 12% spandex (I could have done with slightly more on the forearms). The inner face feels brushed and is very comfortable next to skin, it's a layer I reached for when the weather was revolting and I needed a clothing-hug. It wicks sweat well but being nylon, is slower to dry than polyester or polypropylene. It is also slower to get smelly. Montane uses Polygiene to "prevent the growth of odour-causing bacteria at source': this is a fabric treatment using low concentrations of silver chloride. Construction is simple - front, back, full side panels - and high-quality with neat, flatlocked seams inside and out. The low-profile collar has a short zip protected by a chin guard; I like this arrangement, as the collar works well under layers, with the zip for variable airflow. Length is generous, so the top doesn't ride up under a rucksack and stays in place if it's tucked into trousers. A great cool weather choice for moderate levels of sweat, at a user-friendly price.