waterproofed exterior for mittens? I made camping mats with polyurethane upholstery foam covered with PUL on the bottom and sides, and flannel on top (so the sleeping bag doesn't slide around so much and for comfort). Sometimes the bottom of the tent gets damp. Aprons/smocks for water play for the kids (like at a sand/water table). waterproofed pillow protector to go between the pillow case and pillow for those of us who shower before bed.