Yes. Available sizes include toddler sizes 2T, 3T, 4T and kids' sizes 4, 6, 8, 10, 12; several listings explicitly offer size 6.
Options include long-sleeve tops with long pants, short-sleeve tops with shorts, and long-leg styles (for example microfleece long-sleeve sets).
Yes. Some children's Spiderman sleepwear listings note the garments are flame-resistant and designed to fit snugly to meet safety regulations.
Many sets include a small amount of spandex (for example 95% polyester/5% spandex) or list spandex in the materials, giving them soft, flexible stretch suitable for movement and a snug fit.
They typically use a front zipper—either a full front zipper or a half/partial front zipper—to make on/off easy.
Designs range from retro or panel-style superhero and suit-inspired motifs to all-over prints of webs, masks, and character faces, often featuring bold, character-focused artwork across tops and bottoms.