The invention provides a thermal control combination yam system comprising a first plurality of the yams within said system comprising microdenier or almost microdenier hydrophobic yams, such as, for example, polypropylene (PP), and a second plurality of the yams comprising less hydrophobic ultra microfibres (UMF). Said system comprises a ratio of said yarns ranging from between 97% yams comprised of a microdenier or almost microdenier hydrophobic material and 3% yams comprised of ultra microfibres (UMF) comprised of a less hydrophobic material to 97% yams comprised of ultra microfibres comprised of a less hydro phobic material and 3% yams comprised of a microdenier or almost microdenier hydrophobic material and said first plurality of yams is in direct contact with said second plurality of yams.
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