Finally found a swim cap that: keeps my hair dry; isn''t too tight (I get migraines); stays on; wasn''t expensive.  I hope it lasts a long time!

The cap does not give me a headache like the silicone one did.  It's nice and flexible with great elasticity, just as described.   I have to get my hair very wet in the shower in order to put the cap on, but the chlorinated water of the pool doesn't get at my hair.
The cap turns yellowish on the outside.
It must be dried thoroughly after use, or it will stick together to itself.

Too tight, unable to wear

excellent cap. i had to return a silicone one before i found this one because it was so hard to put on. latex is much softer & flexible.