Blankets, quilts, duvets, comforters and other bed covers are laid over the top sheet. Bedding is limited to pillows and duvets. Fogarty (company) make duvets and pillows in Fishtoft, Boston, next to The Haven. Duvets can be made warmer than blankets without becoming heavy. Most militaries have blankets as compulsory for sleeping quarters in preference to duvets. In Asian countries like India and Pakistan, duvets are known as "ralli quilts" or razai. Manufacturers may also offer up to 15 tog duvets. Duvets are the most common form of bed covering, especially in northern Europe. John Cotton at the A62/A644 junction in Mirfield are Europe's largest producer of duvets. Types include underblankets, overblankets, throws, and duvets. Manufacturers rate the performance of their duvets in togs, a measurement of thermal insulation. From the 16th century, wealthy people all over Europe began buying and using such duvets.