Factor 1 Unisex Short Sleeve Base Layer Tops are one of the best lightweight thermal underwear ranges for general outdoor use.

These unisex tops are manufactured from stretchy tubular 100% polyamide ribbed fabric with a hydrophilic treatment for superior moisture management. Generous body lengths allow a decent amount of fabric to be tuck in to your trousers, helping to prevent lower back exposure. The set-in sleeves provide a close but comfortable fit around the armpits and shoulders, maximising insulation and moisture transportation, whilst the round neck design stretches when placed over your head.

These base layers cross over in to anything from, skiing, through to hiking and camping, and can be used in combination with Sub Zeros Factor 2 mid layers for extra warmth in extreme conditions.

Please note: These are end of line garments. There may be some slight colour variations where they have been folded, and some may have different versions of our logo, but apart from this these base layers are perfect. We have greatly reduced the price to reflect this.