Linen/cotton is the ideal fabric for warm weather. It is actually cooler than pure linen because it is not as dense and stiff. It is also suitable for year-round wear as you can just wear an undershirt or add more layers for warmth. This blend also lacks the slubs and wrinkle-prone nature of linen and is appropriate with a suit.
The fabric is milled in Italy by SIC Tess, who specializes in linen. Their linen/cotton is the best in the world. The voile weave is an open weave that breathes well without being transparent.