Are these straps adjustable? I know that it says that thay are in the info, but some reviews say that they aren't.

No they're not adjustable. The ends attach to the sun glasses and the cord hangs behind your neck as it. Nothing to adjust.

What is the difference between C-line and C-mono?

It's the material the strap is made of, the mono is made of monofilament the c-line is a rubber coated material

Hi Marie,The retainer is about 18 inches long. It is much shorter than most retainers, it is made to fit closely as some people don't like their sunglasses to hang too low. Please keep in mind that the strap has a breakaway feature to prevent strangulation, much like a cat collar therefore has no warranty privileges. It is an awesome super light weight strap and honestly most people love them, just beware not to yank on the glasses or you will snap off the end.I hope this was helpfulEJ's SunglassesAuthorized Costa del Mar dealer

This add is deceiving, picture in add indicates 16" length, after placing in cart, item then lists as 13" ultra thin retainer? Need 16" or longer ???

Hello, The strap from end to end is 20" EJ's

C Line Retainer | Desertcart Grenada

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EC$147

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Sold byAmazon GrenadaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🕶️ Never lose your shades, always own the moment.

DURABLE STYLISH - Premium coated wire with signature logo bead for lasting performance and brand pride
CUSTOM FIT COMFORT - Adjustable 20-inch length for personalized wear and effortless convenience
SLEEK MINIMALIST - Ultrathin wire ensures a barely-there feel with maximum style
SECURE ALL DAY HOLD - Keeps your sunglasses perfectly in place, on and off the water
UNIVERSAL COMPATIBILITY - Designed to fit all Costa sunglasses seamlessly—no compromises

The Costa Del Mar C-Line Retainer is a 20-inch ultrathin, lightweight coated wire strap designed to securely hold all Costa sunglasses. Featuring an adjustable length and a signature logo bead, it combines durability with sleek style, ensuring your eyewear stays put whether you're on the water or on the go.

Reviews

S**R

The length is a bit shorter, but I like how it keeps my glasses up a bit higher when not wearing them. Great construction. Works perfectly with my Costa glasses.

20.08.2025

H**E

Easily clings, extends & shortens easily too.

20.10.2025

R**S

great product

21.07.2017

D**.

Good strap. Seems to be well constructed. Purchased it to use at work but like it so much I use it all the time.

2.11.2025

A**R

The description says it is compatible with all Costa, i have jose 10. Sadly doesnt fit.

16.07.2022

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