Laying flat Armpit to Armpit is

16.6

Total length 21.5

The sweater says Med but it looks like it runs small.

This Ralph Lauren Active purple dragon zip-up cotton cardigan sweater jacket is a stylish and comfortable outerwear option for women in size L. Made with cotton, this jacket features a sweater style with a cute dragon design, perfect for adding a pop of color to your outfit. The zip-up functionality makes it easy to put on and take off, while the regular fit ensures a comfortable and flattering silhouette.