Transformers Converting Optimus Prime Costume for Boys

The jumpsuit is 100% polyester jersey knit, so it's soft and flexible, and the gloves are soft as well. The foam pieces, including the truck cab, wrist cuffs, and boot covers, are rigid urethane foam, so those will take up the most space when packing. We don't have a packed box dimension to share, but the foam truck cab is the bulkiest piece and is the main thing to plan around if suitcase space is tight.
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The boot covers do scale with the size, so the 4/6 boot covers will be larger than the 3T/4T ones. Since the boot covers have an elastic band at the upper edge, they're designed to fit a range of leg sizes within each size group, and comparing your child's measurements to our size chart is the best way to land on the right fit.
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The mask dimensions aren't broken out separately by size in our information, so we can't confirm whether it's identical across sizes. What we do know is that the mask has an elastic band around the back of the head, which gives it some flexibility in fit.
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Both are included! The mask and a pair of gloves come with the costume, along with the jumpsuit, truck cab, wrist cuffs, and boot covers. Everything ships together as one complete set.
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The step-by-step transformation instructions are actually printed right on the costume's packaging, so that's your best guide for exactly how the straps work and where they attach to keep the truck cab secure. The package walks through the full robot-to-truck conversion, which is where those strap details will be spelled out clearly.
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Hey, if you look at our size chart we have dimensions for all of our sizes. If you would like to get the best fit we recommend to measure your child first and find the size that fits them best. It also looks like this costume could run slightly large so you could go up one size just in case.

The costume's includes list covers a jumpsuit, truck cab, wrist cuffs with attached tires, gloves, boot covers with attached tires, and a mask, but no clear plastic straws are mentioned as part of this costume. If you found two clear straws in the package, they may be structural supports tucked inside one of the foam pieces, like the truck cab or wrist cuffs, to help them hold their shape. Check the transformation instructions printed on the package, since those walk you through assembling the costume into both robot and truck mode and may show exactly where those pieces go.
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The full transformation instructions are printed right on the item's packaging, so that's your best guide for the step-by-step setup. What I can tell you is that the costume includes wrist cuffs and boot covers that each have tires attached, so the tires are already part of those pieces rather than separate strips you need to connect.
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The largest size we carry for this costume is Size 10/12, which has a 33" chest, 22.5" sleeve length, 28" torso, and 26" inseam. If your child's measurements are close to those numbers, comparing them against our size chart is the best way to find the right fit.
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The full transformation instructions are printed right on the item's packaging, so hang onto that box! For the cab itself, the foam truck cab has a head hole in the top for robot mode, and a mesh covered windshield for truck mode, so it's designed to sit over the head and shoulders to switch between the two looks.
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Of course grown ups want to be able to transform, too! You can find the adult Optimus Prime converting costume under item number DI104939.