does this come with a CO2 arming cartridge?

No it does not. You have to purchase the Co2. Only place I could find was on Amazon.

Are these easy to swim in? Will they affect buoyancy? I’d like to use this while spearfishing.

I don't think they're meant to use for swimming, as they will inflate within a few seconds of being in the water.

Can this pfd be used for offshore sailing? there is a d ring on the pfd can be a harness to clip the tether to but this has 1 instead of 2 d rings

It appears that you could clip a safety line to the D ring. I however wouldn't use this for offshore sailing as it's a manual inflate (you have to pull the self-inflate tab vs. being water activated) model. If you are partially / fully incapacitated when you go into the water it's not going to inflate and won't do you much good. I bought the manual inflate version as I use it when flying and if I ditch into water, presuming I survive that, I don't want it to inflate while I'm still inside the plane and impede my egress. Also, I'm not sure that the life vest would be secure enough and not potentially come off / fail as would not be the case with a true safety harness.

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Eyson Inflatable Life Jacket Life Vest Highly Visible Manual for Adults (Black)

Product ID: 616512612

Details

Age range (description)
Adult
Brand
Eyson
Colour
Black
Material
Neoprene
Size
One Size

🪶Lightweight polyester oxford

⏱️2-3 sec rapid inflation

⚖️Supports up to 330 lbs buoyancy

S$310

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Description

🌊 Stay afloat, stay fearless — your ultimate inflatable life vest for every adventure!

FEATHERLIGHT COMFORT - Crafted with tear-resistant polyester oxford for a barely-there feel that won’t weigh you down.
INSTANT SAFETY BOOST - Inflates in just 2-3 seconds to keep your head above water—because every second counts.
BUILT TO LAST REUSE - Equipped with a 33g CO2 cylinder and green clip for quick, hassle-free reusability and easy maintenance.
BACKUP INFLATION ASSURANCE - Includes a manual oral inflation tube on the left side for added peace of mind when you need it most.
UNIVERSAL FIT MAXIMUM SECURITY - Adjustable chest strap designed to comfortably fit most adults up to 330 lbs with 150 Newton buoyancy.

The Eyson Inflatable Life Jacket is a high-performance, manual inflation vest designed for adults, combining rapid 2-3 second inflation, durable yet lightweight polyester oxford fabric, and 150 Newton buoyancy to support users up to 330 lbs. Featuring an adjustable chest strap, reusable CO2 inflation system, and backup oral inflation tube, it offers reliable safety and comfort for paddlers, boaters, and water sports enthusiasts who demand both protection and freedom of movement.

Specifications

ASIN	B08PZ8J1RK
Additional Features	Adjustable, Inflatable, Lightweight
Age Range Description	Adult
Best Sellers Rank	#50,765 in Sporting Goods ( See Top 100 in Sporting Goods ) #39 in Life Jackets & Vests
Brand Name	Eyson
Closure Type	Buckle
Color	Black
Customer Reviews	4.4 4.4 out of 5 stars (40)
Fit Type	Comfort
Included Components	Life Jackets
Item Type Name	Life Jackets & Vests
Item Weight	1.9 Pounds
Lining Description	Neoprene
Manufacturer	Eyson Lifesaving Equipment
Manufacturer Part Number	ES639717-150M-BLA
Material Type	Neoprene
Maximum Weight Recommendation	150 Kilograms
Minimum Weight Recommendation	149.69 kg
Outer Material	Polyester
Personal Flotation Device Type	Life Jacket
Size	One Size
Strap Type	Adjustable
Unit Count	1.0 Count

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S$310

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to SINGAPORE.

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Fast, free shipping, member pricing & priority support.

Join PRO →

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TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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