If you soon find yourself gawking at foliage and noticing a chill in the evening air, there's a good chance that fall has descended upon you.

But there's only one way to know for sure.

Look to your left, then to your right. If everyone around you is swathed in a cozy henley, then you can confirm that it is, in fact, fall. 

Because nothing—not football season, falling leaves nor calendars—signals the start of fall quite like this pullover shirt with its buttoned placket.

So to assist you with this season's most important attire, we've collected 10 great henleys and placed them below. Wear them on their own, or enlist them to layer over or under basically anything else you own as temperatures begin to drop.

Taylor Stitch and Danner teamed up for the new Ridge + River Collection, which features five adventure-ready pieces, including this handsome sweater henley. It's made from 100% merino wool in a rugged waffle weave that's the perfect weight for fall. $188, Taylor Stitch

Colder days require heavier henleys, like this heavyweight jersey cotton henley with a soft, vintage-inspired wash and military-style buttons. $120, Alex Mill

Recycled cashmere joins merino wool with a thermal-like texture in a pullover that's part sweater, part henley, and entirely comfortable. $298, Outerknown

This 100% Supima cotton henley features a waffle weave that sounds delicious, but its chief purpose is to be comfortable and look good. $98, O.N.S.

Mack Weldon's Warmknit micro-waffle henley provides all the warmth of a sweater without the weight. $68, Mack Weldon

Patagonia's built-to-last henley is made from a blend of 55% industrial hemp and 45% organic cotton. It's also one of the more affordable pieces you'll find at this quality. $55, Patagonia

This lightweight thermal henley is crafted from textured cotton and heavily washed to give it a timeworn, weathered appearance. But in a nice way. $145, RRL

This super-soft, stretchy henley is moisture-wicking, made to move, and protects you from the sun with its UPF 30+ construction, so you can stroll in the park, tailgate or otherwise enjoy the elements. $74, Vuori

Proof's 72-hour henleys are travel-ready, made from a soft merino wool blend that wicks moisture, resists odor and regulates temperature to withstand multiple wears. We're not saying you should, but it's nice to know you could. $128, Huckberry

For a budget-friendly option that still looks great, try this roomy, heavyweight cotton henley with a pair of jeans and sneakers. $50, Abercrombie & Fitch