# How does the breathability of LiteShell™ and ProShell™ perform in high-activity and high-altitude scenarios?

> Source: https://breathablefilm.com/news/knowledge-center/liteshell-proshell-high-altitude-performance/
> Author: kh_sales02
> Published: 2026-05-07
> Updated: 2026-08-28

## Key takeaways

- LiteShell™ uses microporous PE/PP films with millions of micro-pores that give immediate vapor exhaust during high-sweat activities like trail running or cycling.
- ProShell™ uses non-porous monolithic PU/TPEE films that block 100% of wind penetration while actively pushing moisture outward through diffusion.
- Breathability in monolithic films like ProShell actually increases as the temperature and humidity gradient between body heat and cold outside air grows stronger.

## Frequently asked questions

### How does the breathability of LiteShell and ProShell perform in high-activity and high-altitude scenarios?

LiteShell, paired with microporous PE/PP films, excels in high-activity scenarios like trail running or cycling because its millions of microscopic pores give sweat vapor an unobstructed exhaust path, keeping MVTR high and preventing clamminess. ProShell, built on a non-porous monolithic PU/TPEE film, is engineered for high-altitude conditions where it blocks 100% of hurricane-force wind penetration while actively diffusing moisture outward, preventing the trapped-sweat freezing that causes hypothermia, and its breathability actually improves as the temperature and humidity gradient between body heat and cold outside air grows more extreme.

### Why does ProShell™ actually perform better in colder, harsher conditions?

Monolithic membrane breathability is driven by the temperature and humidity gradient between the inside and outside of the garment. The colder and drier the outside air, the stronger the molecular push of moisture vapor escaping outward.