  Stable envelopes, introduced by Maulik and Okounkov, provide a family of
bases for the equivariant cohomology of symplectic resolutions. The theory of
stable envelopes provides a fascinating interplay between geometry,
combinatorics and integrable systems. In this expository article, we give a
self-contained introduction to cohomological stable envelopes of type A bow
varieties (an interesting class of varieties extending Nakajima quiver
varieties). Our main focus is on the existence and the orthogonality properties
of stable envelopes for bow varieties. The restriction to this specific class
of varieties allows us to illustrate the theory combinatorially and to provide
simplified proofs, both laying a basis for explicit calculations.
