This size 12 rash guard is teeny & isn''t even close to fitting my 9 yr old son who is slim. Too small for my 7 yr old daughter also. Returning. Not at all true to size. Frustrating.

I had to order this rashguard two sizes up for my boys (they don't want it skin tight but also don't wear it baggy).  The pink that I ordered for my daughter was a bit closer to true to size (maybe ordered one size up).  
Quality of the actual rashguard itself is great.  Just wish the "O'Neill" logo came in some different colors like Navy on White.
Overall, I'd buy this again next year as the product offers good sun protection and holds its shape.

Great product however not true to size.  My daughter wears a size 10 but I would recommend two sizes larger.

Arrived quickly. I thought it was too small until i tried it on. Fits good. Hey happy.

nice rashgaurd but extremely small.  I bought size 6 for my nearly five-year old and I can barely get it on him.

My sons and I love these types of swim shirts because they offer sun protection.  I feel comfortable that they are not getting sunburn and they feel comfortable running and playing at the beach or in the pool.  However, this particular brand has proven to be problematic.  First of all, they run extremely small.  This is something that I was aware of after reading prior reviews so I ordered 2 sizes larger than they usually wear.  My 5 year old is in size 6/7 for every day t-shirts.  So, I ordered a size 10.  It wouldn't even go ON him.  I returned it (without issue) for a size 12.  This one was also too small and the stitching around the neckline was stitched wrong side out.  I've returned the size 12 in exchange for a size 14.  I have not yet received that one.  Let's hope it works out.  If you are considering the purchase of one of these shirts, I would suggest ordering a far larger size that you would ever imagine and also plan far ahead of the time that you will be needing it (to allow for returns/ exchanges).