- thermal baselayer is produced using Climate poly fibre. * Climate poly fibre has unique qualities. * the method of knitting creates a fluid transporting system with thermal properties. * it provides optimal transportation of bodymoisture.* it gives a comfortable, warm and dry feeling. * it is easy to wash. * very suitable for sport at average to low temperatures such as: soccer, hockey, mountainbiking, outdoor training, speed skating, running and skiing. * usage: from -5?C(23?F) to 20?C (68?F).