I am 6’1” and was not sure as to what size I should get so I decided to go with the Xl. I’m glad I did the sleeves where a little short. The rest of the suit fit fine. I did have a few concerns about the accessories. The Velcro that holds on the shell did not line up well. It made the back pull a on my neck a bit. The mask was not the best. It comes smashed in a bag. I figured I could wrap it around something round to get the shape back but it was not successful. I ended up using a hot glue gun to fill in areas of the face to give it shape back. Kinda like Botox I guess. The eye slits where small and hard to see out of. Over all I would say it’s a good costume for the money. Those small things where not a huge deal.I BOUGHT MY 10 YEAR OLD SON THE CHILDRENS LARGE BUT IT FIT HIM SNUG. (LIKE LONG-JOHNS).SOO SADLY WE HAD TO RETURN IT.THEN I WENT AHEAD AND BOUGHT HIM THIS ONE SINCE IT WAS THE NEXT SIZE UP ...AND OBVIOUSLY IT FIT HIM KINDA BIG.WHICH IS NOT REALLY A PROBLEM BECAUSE HE CAN GROW INTO IT.AND WEAR AND PLAY WITH IT ALL YEAR IF HE WANTS.THE ONLY COMPLAINT I REALLY HAVE (TO MY LUCK) IS THAT THE MASK WAS CUT WRONG (CROOKED).IT WAS SHORTER ON ONE SIDE THAN THE OTHER. WHICH MADE THE MOUTH LOOK ALL CROOKED (AND OFF TO ONE SIDE) AND IT WOULD POP OUT ON ONE SIDE WHILE THE OTHER SIDE FIT GOOD.MY SON REALLY GOT SAD BUT WHEN I OFFERED TO RETURN IT HE WAS HESITANT. (HE PROBABLY THOUGHT HE WASN'T GOING TO GET ANOTHER NINJA TURTLE. I SHOULD OF EXPLAINED MYSELF BETTER TO HIM.)SO HE DECIDED TO KEEP IT.BUT AS A MOTHER, I SEE THAT THE SPARK HE HAD WHEN HE TRIED THE FIRST ONE KINDA DIED OUT WHEN HE TRIED THE SECOND ONE. ESPECIALLY WHEN HE SAID HE DIDN'T LIKE THE MASK CAUSE HE FELT MORE LIKE SHREK THAN A NINJA TURTLE.OVERALL IT WAS A CUTE COSTUME JUST SADDENED BY MY SONS RESPONSE AND HIS ISSUE WITH THE MASK.I HOPE THEY CAN FIX THIS ISSUE OR HOPEFULLY IT WAS JUST ISOLATED DOWN TO A BAD BATCH. (CAUSE HE WANTED TO COLLECT ALL THE NINJA TURTLES AND NOW HE HASN'T ASKED ANYMORE.):-(First of all, I was very confused what size "Standard" was but luckily based on some other reviews, I was able to deduce that it's the same thing as Large. I am 5'6" @ 190lbs and this suit fit like a glove. With all of the extra padding in the right places, it helped to slim down my appearance. I would have given it 5 stars except for the fact that the mask is very flexible so instead of holding a turtle's head shape, it wrapped around my face and I looked like the Hulk in a TMNT costume. It would have been better if the mask was a complete pullover head mask and if the imitation belt was made of actual cloth vs a printed, creased, foam piece. Overall, the custome was well worth the money.The costume was great!,got it for my 8yr old,and it also fit my 14 yr old niece who is about 5"7and small built. my son is a husky lil guy tho but for an adult i would recommend you getting the size up from mine such is the (standard adult)!. Except mask is a lil bit larger but can still work, overall the product was made nice and looked awesome!!received it in the mail like 4 days after I purchased it"wow!My husband is 5'10" and this fit him well. The shell comes un-stuffed so we stuffed it. The face mask was de-formed so we added some padding on the inside to form it like a face. We bought this last year at a very good price so in my opinion, it was worth the money even though we had to tweak it some.Great for event! Velcro on turtle shell works better if not overfilled.Fit was good for me, maybe slightly tight but not much of a bother. I'm 5'8. The mask was in bad shape and maybe a bit small. Went and bought one of the headband eye masks for cheap just so I didn't have to bother with a full mask. Overall good purchase for the price.I kinda like it and it fit good. I'm gonna wear it at the dragoncon parade because I join with the ninja turtles group. They I can any type of Michelangelo.Great costume but has its flaws. The costume itself was a great fit and im 5 ft 11" weigh nearly 14 stone and didnt make me sweat all night.. the mask however was ok but couldnt wear it all night so just painted my face and made myself a mask. the shell was flat so bought some stuffing but had to use extra velcrose because of the weight. Overall a good costume and well worth the money (i paid £30)