VIPER 640 M-8 MAINSAIL

Marsoni

M251S

$1293.50

Get it in 3 business days with 1 day shipping. Friday, May 29

VIPER 640 M-8 MAINSAILThe M8 is an update to our tried and true M7 the winningest Mainsail in class history with Multiple World and Continental Championships. With a proven shape that delivers unparalleled top end speed and a forgiving twist profile, the M8 is built from our proprietary North XI laminate cloth. The forgiving nature of this sail makes it easy to get up to speed and stay there!

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Your VIPER 640 M-8 MAINSAIL orders ship within 1-2 business days.

Delivery Options:

Standard: 3-7 business days
Fast: 2-3 business days
Express: 1-2 business days

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Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
To process your return/exchange, please contact us at [email protected]
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This is my 4th Maelreg 1/4 zip shirt. I've lost a lot of weight and looking for clothing that fits well and doesn't feel like a shirt from China. I found that the quality and fit are excellent. The fabric is soft, well made and slightly heavier than other 1/4 zips I've purchased on Amazon. The weight of fabric gives a quality feel. The styles of Maelreg pullovers are great. I get a lot of compliments on these shirts.

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Reviewed in the United States on January 8, 2026

Verified Purchase

Douglas Cooke

Pawtucket, US

★★★★★ 5

MAELREG Clothing Looks Great!

Love this quarter zip. MAELREG makes some comfortable, sharp looking clothing. Their golf apparel is fantastic. The value is worth it. Their shirts are true to size. I am 6', 215lbs and wear an XL, which fits nicely.

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Reviewed in the United States on February 16, 2026

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Jenny Nicole

Waukegan, US

★★★★★ 5

Great for Tall Guys

I got this for my husband, he has a pullover that he has worn for years and it needed replacing. Finding one like this that was lightweight and loose fit was a big challenge. He loves the quality and fabric and its not hot but still helps when their is a breeze or chill. I liked that the color and pattern are versatile for all seasons. He is 6'5 and it actually fits his torso! Just get it!

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Reviewed in the United States on February 9, 2026

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John H.

West Palm Beach, US

★★★★★ 5

It’s a hit!

Color: Brown Grey Camo, Size: Large

I picked on of these up after seeing it online. I have multiple Maelreg items and all are great quality. They are my go to golf and casual clothing brand. Super comfortable, soft, light weight, and perfect fit. Olive on the east coast and this color is all the rage in the area. These are some of the best value 1/4 zips out there.

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Reviewed in the United States on February 3, 2026

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LEE SMOLEN

Cuba, US

★★★★★ 5

great look

Color: Pink Small Fish, Size: Large

I am a many time customer of this provider. Excellent always - never an issue on look or fit.

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Reviewed in the United States on April 14, 2026