TGN Compares: Sloomb Underwoolies to Sloomb Wool Covers

With the release of the gorgeous new winter line-up of colors from Sloomb, you may be ready to hop into using wool as a cloth diapering option. Starting out using wool may seem intimidating, with the various styles available and the different course of maintenance, but fear not! We’ve got your back! We are here to break down the differences between two of those styles, Underwoolies and Covers. (If you’d like information about why you would use wool as a diapering option, or how to care for your wool, here are a few helpful links for you!).

Sloomb Underwoolies and Covers are both fantastic options to be used as diaper covers over fitted diapers, flats, pinned prefolds, or any PUL-lined diaper if you are using as a backup to leaks,or a non-diapering garment. They seem sort of similar - both cover almost exclusively just the diaper area on a child. But, there are a few very obvious and not-so-obvious design differences when you look up close and have them in hand. Since we can’t put them both in your hands (unless you buy them of course!) here are a lot of close-ups to show how these different pieces vary.


Focusing from the top down, you can see that the waist of each style is quite different. Underwoolies feature an elastic waistband that sits very flat against baby’s body, and contours ever slightly with the rest of the shape of the garment. Covers feature a thick band of knit ribbing, creating longer/taller waistband coverage, that draws narrower than the Underwoolies waistband does at rest while still being able to stretch wide to accommodate baby bellies. Both provide a great fit around baby and over the rise of the diaper that you put on underneath, although some parents find that the waist on Covers is more accommodating on very rolly polly baby bellies.


Similar to the waistband, the Cover features thick ribbing around the leg gussets, that draws narrower openings to the legs (but stretches an incredible amount to accommodate for thicker baby thighs). The Underwoolies leg opening does not have ribbing, but instead is a rather smooth fit in the same style knit as the rest of the garment.. Because of this, the leg openings do not constrict to fit around the thighs of the wearer in the same way that covers do. This difference in fit may make a difference to you if your baby has rather thin or narrow legs/thighs, as the cover could provide for a fit without gapping.


Both garments have double layers of knit fabric in their construction. However, the way they are knit and the fabric content of the knit makes it such that the covers are significantly thicker all around than underwoolies. This could help you determine which piece would be better for you based on your needs. If you are looking for a trimmer fitting piece to be worn under clothing, or looking for a lighter-weight daytime piece, you will probably prefer Underwoolies to fill that need. If you are looking for an overnight juggernaut, or don’t need your wool garment to fit under trim-fitting clothing, then covers may suit your needs best.

Materials and Wash Instructions

Underwoolies and Covers are both made of merino wool yarn. Merino wool is softer than you can even imagine - no itchy wool here AT ALL. The fabric content on Covers is 97% wool, and 7% spandex, whereas the fabric content on underwoolies is 100% extrafine easy care merino wool. So what’s the difference? Easy care wool has the ability to be laundered by machine. This easy care material is exclusive to newer colors of Sloomb Underwoolies (so far, this includes Orchid, Dragonfly, Seedling, Starlite, Hebrides, and Sweet Tooth) and Sloomb Playwoolies - all other styles are not the easy care fabric, and cannot be machine washed. For machine washing, you will want to turn the garment inside out, wash with like colors in warm water, and use delicate or wool wash. However, hand washing is still the recommended wash method. For the person washing the garments, it’s a little more controlled to wash delicates like wool by hand. For hand washing, you will want to use warm water and delicate or wool wash. For all Sloomb garments you will want to avoid bleach and whiteners, irons, dryers, and dry cleaning - just a wool or delicate soap, and laying flat to dry, lanolizing after you wash if you are using the garment as a diapering method, and that’ll do it!

So there you have it! Any questions? You know we'd love to help you! Drop us a line!

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