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4iiii - Viiiiva Heart Rate Monitor
4iiii - Viiiiva Heart Rate Monitor
4iiii - Viiiiva Heart Rate Monitor
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4iiii - Viiiiva Heart Rate Monitor

Marsoni M251S
Sale price$134.90
Pay 4 payments of $33.73 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
4iiii - Viiiiva Heart Rate Monitor4iiii Viiiiva HEART RATE MONITOR Take Your Training To Heart: The 4iiii Viiiiva is a precision instrument designed to capture the most accurate picture of your internal physiological effort. Whether youre pushing through a high intensity workout, pacing a marathon, or climbing the virtual mountains of Zwift, the Viiiiva provides the real time data needed to optimize performance, track cardiovascular fi tness, and manage recovery with professional
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  • 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
4.2 ★★★★★
Based on 360 reviews
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Product Reviews
A
Verified Purchase
Amazon Customer
Lexington, US
★★★★★ 5
Exceptional!
Size: Large, Color: Black/Black/Black
Best socks I have ever worn. Already bought more.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 31, 2026
J
Verified Purchase
Jakub Ontko
Natrona Heights, US
★★★★★ 5
everything ok
Size: Large, Color: Black/Black/Black
everything ok
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026
S
Verified Purchase
Shelley Young
Pawtucket, US
★★★★★ 5
Always soft
Size: Medium, Color: Black/Black/Black
Good fit, fast shipping. Love a new sock
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 11, 2026
J
Verified Purchase
Janet Fras
Los Angeles, US
★★★★★ 5
Size
Size: Medium, Color: Black/Black/Black
Fit true to size
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 12, 2026
L
Verified Purchase
Lassiter Denton
Lexington, US
★★★★★ 5
Great quality.
Size: Large, Color: (001) Black / Black / White
Thickness and comfort are great. Quality is great and the same I would expect if I bought at the branded storefront.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 11, 2026

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