Castelli Diluvio UL Shoecover Size:XXLarge and the Spark 900 excels

and the Spark 900 excels in this area

*Updated with a new Fit profile for Modern Boots

and ability to regulate body temperature

A stainless steel crampon can be attached to the toe piece to better serve all ski mountaineering applications

shell makes for easy modifications by a boot fitter for those pesky bunions or bony ankles

Castelli Diluvio UL Shoecover Size:XXLarge and the Spark 900 excelsThis neoprene bootie is designed to withstand wear and tear, with premium 3 mm high stretch neoprene, sealed seams, and an adjustable opening under the foot to accommodate any shoe. The skin out top edge also effectively seals out moisture. 3mm neoprene for water protection and warmth Velcro closure under foot for perfect fit Bottom opening accommodates road, gravel or MTB shoes Sealed seams YKK zipper Neoprene skins at cuff to keep water out Weight: