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The rate at which mass is lost during the Red Supergiant evolutionary stagemay strongly influence how the star appears. Though there have been manystudies discussing how RSGs appear in the mid and far infrared (IR) as afunction of their mass-loss rate, to date there have been no suchinvestigations at optical and near-IR wavelengths. In a preliminary study weconstruct model atmospheres for RSGs which include a wind, and use these modelsto compute synthetic spectra from the optical to the mid-infrared. Theinclusion of a wind has two important effects. Firstly, higher mass-loss ratesresult in stronger absorption in the TiO bands, causing the star to appear as alater spectral type despite its effective temperature remaining constant. Thisexplains the observed relation between spectral type, evolutionary stage andmid-IR excess, as well as the mismatch between temperatures derived from theoptical and infrared. Secondly, the wind mimics many observed characteristicsof a `MOLsphere', potentially providing an explanation for the extendedmolecular zone inferred to exist around nearby RSGs. Thirdly, we show that windfluctuations can explain the spectral variability of Betelgeuse during itsrecent dimming, without the need for dust.

The impact of winds on the spectral appearance of Red Supergiants