GOOGLES/ BACKSTOKE HELP?

well prolonged story reduced i similar to prosaic shapped googles (my sister mislaid them though my permission) so i had to buy a brand new pair(which was poor though it was TYR)http://www.jensonusa.com/product/ey/EY40…
TYR ^^^^^^ nonetheless i beheld olympic swimmers appear to wear this sort T-T
for float teams do i need to wear a TYR kind of character or can i wear a prosaic flush lens span of googles like:http://www.global-b2b-network.com/direct…
(thats a example)
Thanks. Also when i do a flip spin i forgot how to flip correctly. When i flip i go unequivocally distant underneath H2O after i done a flip. Tips?

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