Will Reitveld recommended these lightweight boots in his latest Outdoor Retailer writeup – some with removable liners. He does a fantastic job:
-Baffin Men’s Revelstoke Boot and Women’s Sage 400g insulation and removable liner – Baffin Ultralite Series of extreme lightweight footwear is designed for use in a temperature range of +41F to -58F (note that the lower rating is typically optimistic.) Two especially lightweight models are the Sage for women (left, $159) and the Revelstoke for men (right, $179). Both contain the equivalent of 400 gram insulation and have a removable liner with reflective technology. The weight is listed as 2 pounds per pair; I was not able to verify the weight. http://www.baffin.com/product-p/litem002.htm
-Arcteryx Bora 2 Mid Removable liners for wash-ability, dry-ability and usage on their own – In the top styles Alpha2 FL Men’s and Bora2 Mid, those liners are completely removable for improved wash-ability, dry-ability and can also be used separate of the shell as a hut/camp shoe. To extend the use and the climate adaptability of the shoe Alpha FL2 and Bora2 different liners, offering higher water protection and insulation are available separately.
-Arcteryx Alpha FL Low
-Vasque Arrowhead Ultradry Boot and Vasque Skadia Ultradry features 200 gram Thinsulate insulation, a heat-reflective lining, a zippered waterproof outer shell, and quick-draw lacing on the inner boot. Men’s weight 2 pounds 12 ounces per pair, and MSRP is $170. Perfect boot for active snowshoeing.
-Vasque Snow Junkie insulated boot, which is wonderfully lightweight and perfect for snow hiking.