SnugFleece Wool Mattress Pads provide unsurped comfort! These pads offer superb craftsmanship and quality that is not found elsewhere. Wool has a unique way of accommodating fluctuating body temperature helping you stay warm in the winter and cool in the summer. These pads fit directly on your mattress, under your fitted sheet. In winter, air pockets between wool fibers trap body heat and keep warm air circulating freely, providing a consistent body temperature that allows deeper, more restful sleep. In summer, wool's absorbent, hollow fibers wick moisture, keeping the air next to your skin dry, and eliminating that damp, clammy feeling. Sheets remain cool and crisp even on muggy nights. This dry environment discourages growth of mold and mildew, a plus for people with allergies. Soft, cushioned support conforms to contours of your body to ease pressure points and aid circulation. This helps eliminate restless nights, stiff neck, lower back pain, painful joints, arm and hand numbness. 100% American virgin wool is clean, odor free, and naturally flame resistant.