I bought 5 different jackets/sizes to compare. L and XL sizes for Classroom Big Boys (http://www.amazon.com/gp/product/B003AE8IDO), S and M sizes for Classroom Junior (http://www.amazon.com/gp/ product/ B002D4ILFW) and Ultraclub Small Size (http://www.amazon.com/gp/product/B0031QS3Q8). The jackets for boys are true to size. I would say large is size 12-14 and XL is size 16-18. Junior Small is almost the same size as XL boys. The difference between them is that the Junior S cuffs are tighter than the XL boys. The junior also has a drawstring hood, compared to a small stretch section at the top of the hood. Comparison of the Classroom brand with the Ultraclub brand. The Classroom brand has a slightly thicker sweatshirt-like fleece lining. Ultraclub Small is slightly larger than Classroom. Junior Medium. The Ultraclub has narrower cuffs (only an approx. 3/4" elasticated cuff) compared to the larger approx. 2" cuffs from the Classroom brand. The Ultraclub doesn't have cuffs at the bottom of the jacket, just a thick drawstring with a plastic bell. The Ultraclub has an extension pleat at the back of the shoulders to increase space. The style of the Ultraclub hood is slightly different - the zip goes further into the hood for added neck protection. The hood has a thick drawstring with plastic caps on the ends (my son preferred more drawstring-style drawstrings on the Classroom Juniors).
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