Post contains affiliate links. I purchased this item myself. I was not asked to write, nor was I compensated for this post, and all opinions are my own. Sloomb A.K.A. Sustainablebabyish is best known for their fitteds and wool covers. Sloomb trainers recently joined the lineup in 3 colors and 3 sizes.
I chose the size 1 (12-24 mo/20-28 lbs), , and they also come in size 2 (2-3 years/27-36 lbs) and size 3 (3+ yrs/35-46 lbs.) Choose from rail (the gray I purchased), montauk (pale green) and sunshine (yellow.) The training undies are a knit viscose from bamboo/organic cotton blend with a fleece center panel. They are not waterproof, but provide more absorbency for small accidents than underwear.
I’ve measured them before washing:
After washing:
Here is my son at 23 months and 23 pounds in the size 1:
He is within the size/weight range, and the stock photo shows the model with a bit of a baggy fit, but I’m putting these away until my guy is just a bit bigger! The Sloomb trainers retail for $18.00 each, and can be paired with a wool cover for more protection.
Have you used Sloomb training pants?
Maria wants to live in a world where cloth diapers are the norm and moms can make parenting choices without judgement. When she’s not chasing her 18, 14 and 11-year old kids around, you might find her checking out the latest gadgets, organizing something (again) or exercising in the fresh air. 
This look like they would real good if they are the right fit. With this demonstration you have showed us to keep in mind that they will shrink. Thank you for this information.