Size small (7-18lbs) NWOT yellow wool diaper cover. Imagine Knit Wool Covers are made from super-soft 100% knit wool. They are stretchy, breathable, absorbent, and naturally anti-microbial. They are two layers of knit throughout, with extra stretch in the legs and waist for a snug and comfortable fit. Imagine Knit Wool Covers only needs to be washed every 2 weeks (unless soiled).