We ordered a size up as said in the description ...
359355
We ordered a size up as said in the description, however we should have just ordered her normal size. The size up was a little too big.
2628729
Like others have said, order up. I normally wear a medium and I got a large - it fit like a medium. The material is OK, it doesn't seem like it will last more than 3 washes but we'll see. The style is cute but the zipper is slightly smaller than the ones in the picture. The fabric is thin so the long sleeves are more for fashion than to keep you warm.

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132371
First order was too small, I recommend to order one size up.
4041421
I ordered a size up for my nephew because the reviews said they run small and a size up for him was perfect.
2371821
I read reviews in regards as to how to order the shoe size. It was recommended to order a size up. I did & my partner absolutely loves them. Great boot
3993634
fits good but did order a size up so sizes are not perfect
4345910
My son typically wears 2t clothes because theres room to grow. So I thought I'd be safe ordering a 2t, but instead he ended up walking around with high waters. Should definitely order a size up
3458340
Good quality but fits small defintely size up!
4585206
Had to return this because it was too small. We ordered again one size up and it was a better fit.
1217311
I read the reviews first so I ordered a bigger size in the first place - so they fit fine. My son loves the color and they wear well after wash...
1827513
Arrived as promised and as described. After first washing they did shrink a bit. Would recommend a size up if buying.
2987474
My son loves the shoes, but I ordered one size up after reading all the reviews about how they run so small. The pair we received were actually way too big. I'm returning them and ordering his correct size and hope they fit.
1129957
As indicated in previous reviews, these run small... order one size up.  I'm returning the item so I don't know how they fare in the water.
1441427
I ordered a size up for my God daughter who wears an 8 in women's. I got her the 9. She loved the tennis shoes and the lights worked perfectly. Please order a size up when ordering.
1326420
I ordered these a size up and they are right on the nose for my child but they get the job done for what we ordered them for
2415364
After reading the reviews and pretty much knowing that these run small I ordered a size up for my daughter and it fit perfectly.
4247939
The quality of the product is good, but I had to return it. The medium is should be considered a US small, despite the waist description.  That said I plan on ordering the US L (Tag XL) and will update when it arrives.

Update...The seller was not just responsive to my questions but also refunded my order so I could order 1 size up.  The product fits well once you go up one size and is comfortable all day.