Weight is a proxy for build
In ceramics, glass and metal goods, mass usually maps to wall thickness and thermal behaviour. Light is cheap far more often than it is clever.
Look for the threshold values
22-momme silk, 700-fill down, 40mm drivers: most categories have a number below which the claim stops being true. Learn one per category you shop.
Warranty length is a confession
Manufacturers price warranty against expected failure rate. A two-year term on an expensive object tells you what they expect.
