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The Adidas Ultra Boost 4.0 is a men's running-inspired sneaker built on a full-length BOOST midsole with a sock-like Primeknit upper and a Continental Better Rubber outsole. The 4.0 version adds reflective threading woven into the knit, which helps at night. It weighs about 11 oz in a men's size 9, with a 10 mm offset. The best new price is $169.79 at Amazon as of November 8, 2026, with two stores listing it new.
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Lowest price we've seen: $169.79 on Nov 8 at Amazon. Tracked across 2 stores since Nov 8.
Owners of the Ultra Boost line generally praise the soft BOOST cushioning and the snug Primeknit fit. Common complaints center on the snug, hard-to-put-on fit and the white knit picking up dirt.
The adidas Ultra Boost features a upper with accents of reflective threading implemented directly into the woven base . This could be extremely useful for those who love the occasional nighttime jog, as these reflective accents will provide greater visibility for passing vehicles.
