Yeezy Boost 350 V2 Onyx: Size Guide, Fit & Review

The Onyx runs tight, especially in the toe box, so a half size up is the floor and some owners still find them snug. The non-obvious part: even a half size up can leave little toe wiggle room on the Onyx, so if you have long toes or wider feet, lean toward a full size up. A common owner fix is removing the insole, which frees space while keeping the full Boost padding underneath. Below you’ll find owner reviews, the sizing guide, a FAQ and where to buy.

Yeezy 350 V2 Onyx Review

Here is what owners are saying on r/yeezys:

“I have 350s ranging from 11.5 to 12.5 (11.5 being TTS) and they’re all wearable, as long as you go .5 size up you will be fine.” (r/yeezys)

“I have a few 350s in an 11 that fit perfectly. I had the Onyx in an 11.5 and they were still very tight to the point I returned them.” (r/yeezys)

“Got the onyx in 14s and they’re fairly tight. Barely can wiggle my toes.” (r/yeezys)

For an on-foot look:

On-foot review: whydavis reviews the 350 V2 Onyx with an on-feet and sizing breakdown. (YouTube: whydavis)

Thank you u/Not-Drew_ and u/AlexSmythe for the on-feet photos shared on Reddit.

Yeezy 350 V2 Onyx Sizing Guide

• From your true sneaker size: go at least a half size up, as the Onyx runs tight.
• Long toes or wider feet: consider a full size up, since the toe box is snug.
• Still tight after sizing up: remove the insole, the Boost padding underneath remains.
• From your Ultraboost size: half a size up matches the common 350 V2 advice.
• Compared to the Bone: the Onyx fits tighter at the same size.

The Onyx is one of the tighter recent 350 V2s. Half a size up is the minimum, the toe box is the snuggest area, and pulling the insole is the go-to fix if you are between sizes.

Yeezy 350 V2 Onyx FAQ (based on owners’ reviews)

Do the 350 V2 Onyx fit true to size or should you size up?

Size up at least a half size. The Onyx runs tight, and some owners still find a half up snug, so long-toed or wide feet may want a full size up.

Why is the toe box so tight?

The Onyx is one of the snugger 350 V2s up front. Owners report little wiggle room even sized up, so size to your longest toe.

What if they are still tight after sizing up?

Remove the insole. The shoe keeps the full Boost padding underneath, so you gain room without losing comfort.

Where can you buy the Yeezy 350 V2 Onyx?

The Onyx is easiest to find on the resale market: see current 350 V2 Onyx listings on eBay.

Compare With Other Yeezy Footwear

Looking at other Yeezy shoes? Check the 350 V2 Beluga, the 350 V2 Zebra and the 350 V2 Clay. Want sizing guides for the independent Yeezy footwear line (without adidas)? Visit our independent Yeezy Footwear category.