Nike KD 18 Sizing Guide: Does It Run Small or True to Size?

Fit Notes

Nike Air Force 1

The Air Force 1 is a classic lifestyle silhouette that runs remarkably large and wide. Wearers accustomed to the roomy fit of the AF1 must size up a half-size (for a secure court fit) or a full size (for casual wear) to accommodate the narrow, highly padded performance last of the KD 18. Regarding the compensation factor: sizing up provides necessary width, but going too large can alter how the molded heel counter aligns with the calcaneus.

Nike KD 17

The KD 18 shares an identical cushioning footprint with the KD 17 but updates the upper architecture. Notably, players who previously chose to size down a half-size in the KD 17 strictly to compensate for length-based heel slippage should return to their true size (TTS) in the KD 18, as the redesigned single-piece molded TPU heel counter effectively eliminates any slipping issues.

Nike Book 1

The Book 1 is built on a flatter, wider last with a more rounded, accommodating toe box. Standard-width feet can maintain the same true-to-size length across both models, but wide-footed players who rely on the natural lateral relief of the Book 1 must size up a half-size to a US 10.5 in the KD 18 to mitigate the aggressive lateral forefoot taper.

Adidas AE 2

Adidas performance models like the AE line are constructed on a wider, higher-volume last that typically runs long in terms of absolute length. To achieve a comparable level of forefoot room and midfoot volume when transitioning to the narrower performance last of the KD 18, players must size up a half-size to ensure proper toe clearance and avoid lateral squeezing.