UPDATE (jul. 28/2014): Down to 3 stars. Second pair I bought: after a while templates also broke..... so, don't expect to much, them are cheap .... them won't last long.

Do not doubt it. This ones are spectacular sport sunglasses for us who have to play with prescription LENSES.
I have also Bolle Parole that are very good, these ones probably are superior.
Great material. Outstanding design.
Them come with 4 interchangeable lenses. Easy to change.
Easy to insert the prescription adapter.
Good price.
Nice hard case.

15-04-2013:
Three months of heavy use (>10 hours x week playing tennis) and a temple broke (see pic). I have been really careful with this sunglasses, always kept in the hard case, . I am so sad, these are SPECTACULAR because them are really comfortable during hard playing and cleaning lenses is so easy ........  I will try to contact seller .... we will see ....

16-04-2013:
Seller answered promptly and courteously. No clear reason of why this temple broke, but seller will replace the frame.

Absolutely GREAT after sale service & that's why I keep 5 stars on the item.
I will wash the sunglasses after each use and keep them clean during use.
I bought another pair of these sunglasses today.

27-08-2013: Update: after more than 5 months of heavy use I can still assert that this are very good sunglasses; Final rate 4 stars because temples are a little stiff and become uncomfortable after a long period of use, are a bit stiff and some soarness appears over the ears. I am using a bandana and I put the temples over it.

PS: ok, For other prescription sport sunglasses check my review of&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Bolle-Performance-Parole-Sunglasses-Matte-Black-T-Standard-Lens-Set-Competivision-TNS-Gun/dp/B000R2YQ8I/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Bolle Performance Parole Sunglasses (Matte Black/T-Standard Lens Set (Competivision + TNS Gun))</a>&nbsp;...
oK, if this review was help... please v... thanks!