If you mean size-wise, then I think there are kids caps and adult caps only, but if you mean the material, they aren't, different brands use different materials. The two most commonly used materials are silicon and latex. My favorite is silicon because the latex gets stuck to your hair easily.
Yes they are all the same.
you can wear two but you might get a head ache.
Baseball Golf Swimming Tennis Skiing
Swim Caps are mostly made from silicone
£2.50
No, but pools used for competitive swimming are standardized sizes.
Baseball, Golf, Tennis, Swimming, Skiing
Yes, all 59fifty hats are supposed to have flat brims. That is because 59fifty hats are "fitted" hats.
all the hats she wants
Yes, he went swimming with them and had parties with straw hats they made.
It is almost grammatically correct but not quite.You should say: Both of you have the same hats.You could also say: You both have the same hats.
all kinds of knit hats