I need a replacement strap for my calvin klein ray K3723702

Replace it at a Kalvin Klein store or one that carries their brand.

You should take it back to the supplier.

I know that the guarntees do not cover the strap but it is reasonable to expect a much longer life than this! The strap was "not suitable for purpose".

You should get a replacement free of charge.

Thanks for contacting FixYa,
Hard one to find.
I would try this link and see if you find what you need.
http://www.bablas.co.uk/ck-watch-straps-c-38_39.html
Best wishes.
Jewel

mcdevito75 here, Look for a small watch repair shop in your area for a new strap, for your Calvin Klien watch.

Just about any watch shop or jeweler will have a nice selection of replacement straps in whatever style you prefer and they will typically install the new strap you buy from them at no extra charge.

I presume that the material is elastic.

It would be expensive to buy the strap from a watch shop when you could buy a yard of the material from a hobby shop.

I suggest you find a shop that sells materials for people who make things for a hobby.

try here: http://www.a1watchbands.com/ for example: http://www.a1watchbands.com/product_details.php?search=&id=712 or try on ebay, for example: http://search.stores.ebay.ie/calvin-klein-strap_Watch-Parts-Accessories_W0QQcatrefZC6QQsacatZ10324