![Theory Spring Summer 2021 Mens Collection Lookbook 001 Ryan Keating dons a smart matching look in navy from Theory's spring-summer 2021 collection.](https://www.thefashionisto.com/wp-content/uploads/2020/12/Theory-Spring-Summer-2021-Mens-Collection-Lookbook-001-900x1350.jpg)
Theory looks forward to a new year of style with its spring-summer 2021 men’s collection. The brand delivers versatile menswear that brings together its signature, polished lines with a comfort suitable for working from home and venturing into the city landscape. Ethan James Green focuses his lens on Ryan Keating, Hector, and Jan Carlos Diaz to capture the season. Green steps outdoors to photograph the models in Theory’s latest collection. Front and center, the trio don chic ensembles styled by Ludivine Poiblanc. Varied looks include strong pieces like a belted trench coat and slim trousers or a short-sleeve knit sweater with cropped pants in a matching tone.
Related: UNIQLO Delivers Smart Style with Theory Collaboration
Theory Spring/Summer 2021 Men’s Collection
![Theory Spring Summer 2021 Mens Collection Lookbook 002 Brothers Jan Carlos and Hector Diaz wear tailored ensembles from Theory's spring-summer 2021 men's collection.](https://www.thefashionisto.com/wp-content/uploads/2020/12/Theory-Spring-Summer-2021-Mens-Collection-Lookbook-002-900x1350.jpg)
![Theory Spring Summer 2021 Mens Collection Lookbook 004 Front and center, Ryan Keating dons a suit from Theory's spring-summer 2021 men's collection.](https://www.thefashionisto.com/wp-content/uploads/2020/12/Theory-Spring-Summer-2021-Mens-Collection-Lookbook-004-900x1350.jpg)
![Theory Spring Summer 2021 Mens Collection Lookbook 003 Dressed to impress, models Jan Carlos and Hector Diaz showcase menswear from Theory's spring-summer 2021 collection.](https://www.thefashionisto.com/wp-content/uploads/2020/12/Theory-Spring-Summer-2021-Mens-Collection-Lookbook-003-900x1350.jpg)
![Theory Spring Summer 2021 Mens Collection Lookbook 006 Theory delivers a polished spring-summer 2021 collection with clean lines and classic numbers like a pinstripe suit. Here, models Carlos and Hector Diaz inspire in Theory's menswear.](https://www.thefashionisto.com/wp-content/uploads/2020/12/Theory-Spring-Summer-2021-Mens-Collection-Lookbook-006-900x1350.jpg)