Silkberry Boys Brief 3pk Ship Character Boy's 7pk Briefs Studio Silkberry Boys 3pack Bamboo Underwear Stormy Mix snugonthedanforth Character Boy's 7pk Briefs Studio Character Boy's 7pk Briefs Studio. Our basic briefs underwear is your little boys must have everyday essential. Bamboo fibers are naturally smooth and round with no sharp spurs to irritate skin. Fabric maintains its shape and is not too snug, allowing children to move with ease. Fabric breathes and keeps children cool and comfy. Fabric has silk touch handfeel. Its great for sensitive skin. Fabric: 97% rayon from bamboo 3% spandex