Shafer Vineyards’ 2021 Relentless is a Napa Valley red built around Syrah (97%) with a small addition of Petite Sirah (3%), sourced from “ridgetop and foothill sites along the Vaca Mountains, just south of the Stags Leap District AVA,” according to Decanter. It’s a high-octane wine—Decanter notes 15.8% alcohol—yet reviewers repeatedly emphasize balance and structure over outright heat.

Several critics delivered excellent reviews, led by James Suckling’s 97-point score. Suckling calls it “a supersaturated, deep, almost thick wine that coats the mouth with potent dark fruit flavors,” wrapped in “firm, gripping tannins that need time to resolve,” recommending it “Best from 2030.” That sense of density and aging potential is echoed by Vinous, where Antonio Galloni (95 points) describes a “potent, brooding wine” with “dark cherry, plum, licorice, cloves, game, scorched earth and black pepper,” adding that it “clearly needs a few years in bottle to be at its best.”

Decanter also awarded 95 points and highlights a different side of the vintage, calling the wine “remarkably restrained in 2021,” with “elegant cherry and spiced plum fruit,” plus “sandalwood and rose petal nuances.” Decanter points to “pronounced mineral tension” and “sleek, polished, and well-integrated” tannins, concluding that “despite its 15.8% alcohol, the wine maintains excellent poise and grip, with no noticeable heat.”

Élevage is a major component here, though sources differ on time in barrel: Robert Parker’s Wine Advocate (93 points) says it was “aged 28 months in 100% new French oak,” while Wine Spectator (93 points) reports a production of “1,300 cases made” and calls it “richly textured yet intensely structured,” with “gutsy blackberry, mocha espresso, olive and toasty spice.” Overall, Relentless 2021 reads as a concentrated, oak-polished, cellar-worthy Napa Syrah with strong critical consensus at the top end.