If you're going to try 'cross in New England (woohoo!), you might want a long sleeve jersey as well. Arm warmers are ok to a point, but the long sleeve jersey would be a better purchase IMO. I hardly EVER wear arm warmers when riding or racing, except when the morning starts out cool, and warms up drastically.

I wouldn't purchase INSTEAD OF, but IN ADDITION TO if you are just starting out.

Oh - and if you think you are a M (and wear a size 4/6 normally) you want a size S jersey. When you're riding, you want it to be snug - provides less wind resistance.

SheFly

And ps - any questions about New England 'cross or racing in general - happy to help! Welcome to TE.