The Studio Fix Powder Plus Foundation is a true hybrid product from M·A·C: it performs as both a pressed powder and a foundation in one step. Over recent iterations the brand has updated this formula, delivering a “blur-matte” finish with enhanced oil/shine control and a broader shade range.
In shade NC12, you're dealing with a fair-beige base with a neutral undertone (leaning slightly yellow-olive) that suits those with fair skin and neutral to warm/olive undertones (in the M·A·C undertone nomenclature).
This product is designed to both ‘set’ the skin and provide coverage, simplifying makeup routines for those who prefer powder-based or compact foundations.

Key Features & Performance
According to M·A·C’s official description, the updated Studio Fix Powder Plus offers:

24 hours of oil and shine control. 

A blur-matte finish that reduces the appearance of pores and smooths skin texture. 

Medium to full buildable coverage, with a lightweight, breathable feel despite being a powder foundation. 

Sweat- , humidity- and water-resistance, with a photo-friendly result and no grey cast (important for flash/photography). 

Silky, talc-free texture enriched with extracts such as rose, sugar kelp and red algae — aiming to deliver comfort on the skin.

Note: Packaging may vary, and the product image may differ slightly.