Q36.5 have developed a brand new, proprietary Smart Fabric for the Teddy Berry. The layer next to the skin has a sponge 'frottè' construction (rather than the more common brushed finish), which creates a microclimate close to the skin - efficiently wicking away sweat to keep your body dry and reducing the chilling effect.
For the additional second layer, on the chest, they've used another proprietary fabric (UF Air-Insulation) to add extra insulation where it's needed most, whilst allowing the rest of the body to vent and breathe at maximum efficiency.
The innovative Smart Fabric has a unique first layer that insulates and maintains a dry microclimate close to the body, with very good moisture management thanks to the push-pull construction made by a blend of Polyprolylene and Polyester... The hydrophobic/hydropillic characteristics of the thread allow high breathability with a reduced water load (less clammy/soggy when working hard).