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 Finland

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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€ 46.58

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Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🕶️ Keep your shades secure, stylish, and ready for every moment.

FEATHERLIGHT SECURITY - Ultrathin coated wire ensures your shades stay put without weighing you down.
DURABILITY MEETS STYLE - Crafted from 100% silicone with a sleek black finish for lasting wear and subtle sophistication.
EFFORTLESS MAINTENANCE - Hand wash only, air dry—keeping your retainer fresh and ready for every adventure.
PERFECT FIT EVERY TIME - 20-inch adjustable length adapts seamlessly to your style and activity.
UNIVERSAL COMPATIBILITY - Designed to work flawlessly with every pair of Costa sunglasses you own.

The Costa Del Mar C-Line Retainer is a 20-inch ultrathin, lightweight silicone strap designed to securely hold all Costa sunglasses. Featuring a sleek black coated wire with a logo bead, it combines durability with minimalist style, perfect for active professionals who demand both function and fashion. Easy to maintain and built to last, it’s the ultimate accessory to keep your eyewear safe on and off the water.

Specifications

ASIN	B0058V584O
Age Range Description	adults
Best Sellers Rank	312,554 in Fashion ( See Top 100 in Fashion ) 223 in Men's Glasses Chains & Lanyards
Brand Name	Costa Del Mar
Care instructions	Hand wash only. Avoid contact with harsh chemicals. Air dry.
Colour	Black
Compatible Devices	All Costa Sunglasses
Customer Reviews	4.6 out of 5 stars 6,163 Reviews
Fastener Type	Snap
Global Trade Identification Number	00097963476874
Included Components	cloth
Item Type Name	Leash.
Item Weight	0.02 Pounds
Manufacturer	Pro-Motion Distributing - Direct
Manufacturer Part Number	CE-11
Material Type	Silicone
Material composition	100% Silicone
Model Number	A6S0003KT
Pattern	Solid
Size	20 Inch
Style Name	Costa C-line Retainer
UPC	097963663892 799475042683 097963476874
Unit Count	1.0 count

Reviews

R**S

Five Stars

great product

21.07.2017

S**S

Great fit and built to last

My son loves these sunglasses. They fit well, feel durable, and hold up to everyday wear. Costa Del Mar never disappoints on quality and these are no exception. Would definitely recommend.

2.06.2026

N**.

Muy buen producto este retenedor!

Muy buen producto, calidad en los materiales!

9.03.2026

H**E

Looks good & simple.

Easily clings, extends & shortens easily too.

20.10.2025

K**S

Nice!

Perfect size. Good quality.

3.07.2026

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