The Salewa Cristallo Warm is the heavier of Salewa's Alpine Merino Responsive baselayers, a men's long sleeve top in a 145 g per square metre fabric of roughly 78 percent merino and 22 percent synthetic, weighing about 165 grams. Alpine Merino Responsive is not plain merino: the wool is spun around a nylon core for strength, and the fabric carries thermoreactive minerals that take up body heat and re emit it as far infrared.

• 145 g per square metre: the warm end of the Alpine Merino Responsive family, for cold weather rather than shoulder season.
• Around 78 percent merino: wool for warmth and odour control, with the remaining share providing durability and shape retention.
• Merino spun on a nylon core: the core stops the yarn breaking down the way pure merino does under pack straps.
• Thermoreactive mineral finish: the Responsive treatment absorbs body heat and returns it as far infrared, which is the technology Salewa builds the line around.
• About 165 g garment weight: substantial for a baselayer, which is the trade for the warmth.
• Warmer than the Zebru Medium Warm: if you are choosing between the two, Cristallo is the colder weather option.
• Dark Olive colourway, men's cut
• Men's cut