iPhone 6 Cases

[olds]

I need to find a case for the iPhone 6 that can be tethered to a person. We have bridge inspectors and if they drop their phone, it's in the drink. A water resistant/proof case would be best.

They want a retractable tether. All I find have a "key ring" on the end and I see no way to attach it to a case.

Tether example:

http://www.opticsplanet.com/nikon-retractable-rangefinder-tether.html

Any recommendations?

EDIT

Found a tether that's held on with double sided tape:
http://www.gearkeeper.com/communication/smradio.html

 

[Rakehellion]

 

[Rakehellion]

I was going to suggest double-sided tape.

Here's one that floats and is ugly as sin:
http://m.lifeproof.com/shop/us_en/lifeproof-lifejacket-float-for-fre-iphone-5-case/

 

[maevinj]

I think might would work? I believe it has a place to attach an lanyard.
http://m.lifeproof.com/shop/us_en/iphone-6/iphone-6-case-fre/

 

[Imported]

http://www.amazon.com/gp/product/B00AW2QT8I ?