Keep your feet cozy & warm with these soft organic woolen footlets from LANACare! Made of certified organic merino wool. Single-layer, slightly felted wool. May be worn directly against skin, or as extra layer over socks. Natural lanolin content of wool provides self-cleansing properties for easy care. We like tucking a soft woolen LANACare shoe insole inside of these for extra comfort, to give more of a "slipper" feel! Choose an insole matching your shoe size, or one size smaller - so for example size 38 insole for size 39. When it does begin to feel wet, it remains warm. As wool absorbs moisture & dries, its natural lanolin content removes bacteria & odors, for easy-care. Wash occasionally in LANACare Lanolin-Replenishing Soap to maintain hygienic effects and to keep wool feeling soft & supple. Care Instructions. | European shoe size chart.