Leth produces wines from Austria's Wagram region in Niederösterreich, where loess and sand soils define the terroir. The winery's portfolio centers on Grüner Veltliner, Austria's signature white variety—mineral-driven and herbaceous—alongside Weissburgunder and the red Zweigelt. The Gigama Grande Reserve Grüner Veltliner and Gigama Reserve Zweigelt anchor the range, both reflecting the region's continental climate and the precision required for ripeness at this latitude. A Weissburgunder Trockenbeerenauslese demonstrates the winery's work with noble rot and botrytized fruit, a specialized category demanding exact harvest timing. Wine Spectator, Wine Advocate, Decanter, Falstaff, and Wine Enthusiast have rated Leth's wines, situating them within broader critical discourse on Austrian viticulture.