Light synthetic vest used by runners. Allows great upper body mobility and a tiny bit of warmth.
In-game description

The sport vest is a type of clothing in The Long Dark.

The sport vest can only be worn in the inner jacket slot. By far the worst torso type clothing in the game, it is hard to maintain and not worth to repair due to its low clothing stats.

If a player wishes to wear the sports vest for its mobility and lightness, it is highly recommended to replace it with the down vest at the earliest possible moment. The down vest has the same weight and mobility as the sports vest, but it's twice as warm and twice as waterproof.

Hats and scarfs BalaclavaBaseball capCotton scarfCotton toqueFleece cowlLong wool scarfWool scarfWool toque
Gloves Driving glovesFleece mittensGauntletsRabbitskin mittsSki glovesWool mittensWork gloves
Shirts and sweaters Cowichan sweaterDress shirtFisherman's sweaterHoodiePlaid shirtSweatshirtThick wool sweaterThin wool sweaterT-ShirtWool shirt
Coats, vests and jackets Bearskin coatDown vestExpedition parkaLight shellMackinaw jacketMariner's pea coatMilitary coatMoose-hide cloakOld fashioned parkaSimple parkaSki jacketSport vestUrban parkaWindbreakerWolfskin coat
Underwear Thermal underwearWool longjohns
Pants Cargo pantsCombat pantsDeerskin pantsJeansSnow pantsWork pants
Socks Climbing socksSports socksWool socks
Shoes and boots Combat bootsDeerskin bootsInsulated bootsLeather shoesMukluksRunning shoesSki bootsTrail bootsWork boots
Accessories Moose-hide satchelWool ear wrap
Italics denote craftable clothing items.