What's the difference between a base layer and a rash vest?

The differences between a rash vest and a base layer, when you should be wearing them and why.

Lightweight Base Layer Top (8820)

These are the best Baselayers for hiking, running and cycling Merino and Synthetic

Mens Compression Shirt Base-Layer Sports Top Long-Sleeve Gym Quick

Special Content: Base layers

Best base layers 2024: For men and women

Five of the best base layers

What's the difference between a base layer and a rash vest?

Best base layers for running UK 2024

The 6 Best Base Layers in 2024 – Long-Sleeve Running​ Shirts

Best Cycling Base Layers for Winter Rides