From Shimano:

New XTR and Deore XT 1x11 speed chain rings have been developed thanks to studies with world level cross-country and trail riders in all conditions, from the dry and dusty conditions of the Americas and southern Europe to the heavy mud of winter-time northern Europe.

Efficient chain management was the goal and the new XTR (SM-CRM91 and DEORE XT (SM-CRM81) chain rings do this by introducing a concept called Dynamic Chain Engagement (DCE).

The modified tooth profile on the CRM91 and CRM81 DCE chain rings are designed to provide superior chain retention, lower driving sound and increased durability. Steel plated teeth on the XT version provide greater durability, while strengthened aluminum teeth on the XTR version keep the weight down.

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Shimano XT 11 Speed Chainring SM-CRM81 for FC-M8000-1x11