British duvets are sold in steps of 1.5 tog from 4.5 tog (summer) to 15 tog (extra- warm). The stated values are minimal, actual values may be up to 3 tog higher.
Expert guide to duvets. With more than 20 varieties of natural filling duvets and synthetic fibre duvets on offer ranging from light 3 tog to extra warm 15 tog duvets , ...
This great low-cost and lightweight 10.5 tog double duvet from Argos Value Range will keep you warm and cosy and its non-allergenic and easy-to-wash too.