


mega mass 4000Our legendary Mega Mass has been the weight gainer of choice for ambitious athletes and recreational athletes for decades! Anyone who want to take their training to the next level and grow some muscle mass should try our Mega Mass 4000. Growing new muscle tissue requires not only a high protein intake but also a calorie surplus to fuel the growth process. Some have a hard time getting enough calories through their normal diet, which is why high
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Your mega mass 4000 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]
- Please click here for more details>>> Return & Exchange Policy
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4.7 ★★★★★
Based on 1130 reviews
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Product Reviews
★★★★★ 5
Well made
Size: XX-Large, Color: White
Great look
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2026
★★★★★ 5
Nice when sized correctly
Size: Large, Color: White
I used to be heavier when I started ordering from Amazon, so it’s suggested that I order size “Large”. The following two shirts that I ordered were a “Medium”.
I like the look, and comfortable fit.
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Reviewed in the United States on February 2, 2026
★★★★★ 5
Nice color and perfect fit.
Size: XX-Large, Color: Light Blue
Lightweight, good material, and nice color.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
★★★★★ 1
Fit: Okay, Material: ...Sensory nightmare
Size: X-Large, Color: Black
I actually love how the shirt looks, the fit is long but I'm a pretty short girl.
One con that ruined the shirt entirely for me though is the material... It's grabby and not soft at all. I wanted a cute athletic turtleneck that would be breathable for a hot work environment. This is NOT it.. it immediately suffocates the skin. Sorry, I just didn't like it.
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Reviewed in the United States on January 31, 2026
★★★★★ 5
Super soft, runs small, long tail
High quality, super soft, good neck height, nice price, ready to go right out of the dryer, medium thick material, works well under a sport coat or sweat shirt, snug fit--runs about one size small. Length is about four inches too long. So, ideally made for tall and skinny people (I am short and thick), but going one size up works fine for me except have to tuck it in due to the length.
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Reviewed in the United States on December 26, 2025
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