Barely used Simms Headwaters Boots W's size 5. Great for kids, too. Several years old but only used a few times for a handful of hours total by my kid. According to the various charts I found online, this size is equal to 35 Euro, 21.5 Japanese, 3.5 to 4.0 US W's and Youth. With heavy socks, you can probably start at Youth 2.0 or thereabouts. Carbide removable studs were extra and I installed 6 per boot; they are included and you can rearrange as you like. As you can see, there is almost no wear--the micro-textured surfaces on the sole and all labels inside and out almost 100% intact.