TOG & Wicking


The tog was invented in the 1940s by workers at the Shirley Institute in Manchester as an easier way to refer to a more complex equation regarding warmth values of items ranging from suits to bedding. Tog ratings measure thermal resistance; in other words, how good an item is at keeping you warm by trapping air warmed by body heat. Items with a higher tog value are best for colder conditions whilst low tog values are more suitable for milder times. Different materials have different thermal resistance characteristics so the tog rating does not necessarily relate to an item’s thickness or density.


Wicking refers to a fabric’s ability to move moisture – as invisible vapour or liquid sweat – through itself by capillary action rather than being absorbed and becoming wet. Modern fabrics use sophisticated material technology to ensure that base layers - worn on their own or as part of a layering system - and the wearer’s skin stay dry and comfortable rather than becoming clammy, wet and chilled by evaporation. Once away from the skin, the other layers continue the process of avoiding the accumulation of moisture by transporting it to the atmosphere.