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Sherwin-Williams SW-9171 / Color character

Felted Wool Undertones: What to Compare Beside Your Finishes

Felted Wool is a warm gray with a green undertone. A physical comparison is needed to decide how that character works with your own finishes.

Color guide · Updated September 23, 2026

Living room with layered natural materials and soft window light

Start with the documented color character

Felted Wool is a warm gray with a green undertone. A physical comparison is needed to decide how that character works with your own finishes. Felted Wool adds green to a warm gray with more depth than Acier, making a darker colored-neutral comparison worthwhile.

Why the oatmeal fabric and walnut relationship matters

Oatmeal fabric can soften the scheme while walnut adds weight; the wall should preserve a distinction between those large material areas.

Felted Wool has an LRV of 28; Sherwin-Williams Acier SW-9170 is 32. The difference is 4 points, with Acier returning more light under the reference measurement. Acier is a medium gray with subtle warmth. This supplies a named color control; the LRV gap alone does not identify the warmer, greener or pinker paint.

Use Acier as a control

Give Felted Wool enough illuminated area to reveal its color, then move the same board into the normal shadow. Compare it briefly with Acier. Decide whether the hue is important everywhere or whether a near-black impression is acceptable in the darker parts of the planned surface.

Separate a persistent cast from a comparison effect

Set a less green gray beside it, then choose the sample that joins the fabric and wood most convincingly. The warm-versus-cool comparison covers that related choice.

Keep, compare or change direction

If the unwanted cast remains beside a permanent finish under normal light, that is a practical reason to replace Felted Wool. If it appears only beside an unused sample, remove the comparison and assess the intended palette alone. Before ordering samples, compare room-planning features in the paint color visualizer roundup.

Sources & notes

Color specifications: Sherwin-Williams Felted Wool SW-9171. The recorded LRV is 28. Named comparison values come from the respective manufacturers; material schemes are editorial suggestions.

This guide reviews published color information and proposes practical sample checks. It does not claim first-hand paint testing or customer-review scores. Sherwin-Williams does not sponsor or endorse this site. Product names and trademarks belong to their respective owners. Confirm the color in a physical sample and select the coating for the actual surface and finish.