Nylon generally has a lower melting point than polyester, making it less "hot" in terms of heat resistance. Nylon melts at around 220°C (428°F), whereas polyester has a higher melting point of around 260°C (500°F). This means polyester can withstand higher temperatures before melting, which can make it more suitable for applications where heat resistance is important.
However, in terms of insulation and warmth when worn, nylon tends to feel warmer than polyester because it is denser and less breathable, trapping more body heat.
