Polypropylene, a popular polymer used in textiles, packaging, and various other applications, does not "breathe" in the traditional sense like natural fibers, such as cotton, do. This is because polypropylene fibers are hydrophobic and do not absorb moisture or allow air to pass through easily. Instead, it allows moisture to evaporate off the surface, which can provide a feeling of dryness to the skin. However, compared to fabrics that truly breathe by allowing both air and moisture to pass through their fibers, polypropylene is less effective at regulating temperature and moisture, making it less comfortable in hot or humid conditions. Its moisture-wicking property, though, makes it a popular choice for activewear and situations where keeping the skin dry is a priority.

In Merge Mansion, yarn is produced by combining or 'merging' items through the gameplay mechanics. To create yarn, players often start with simpler items, like wool, which then go through a series of merges to eventually become yarn. The exact source can vary as the game frequently updates and introduces new items and merging chains. Furthermore, event-specific items or special game events can also provide yarn or the materials required to merge into yarn. Keeping an eye on the game's updates and participating in events is crucial for players looking to efficiently produce yarn for their in-game tasks and challenges.

The rate of polyester yarn can fluctuate based on several factors including raw material costs, specifically the price of purified terephthalic acid (PTA) and monoethylene glycol (MEG), demand for polyester garments, and global economic conditions. Energy prices also significantly affect production costs. Generally, in the global market, polyester yarn prices can range widely, with variations across different qualities and specifications. For a specific rate, it's essential to consult current market prices or contact suppliers directly, as rates can change daily. Moreover, geopolitical events, trade policies, and environmental regulations can further influence rates. Manufacturers or buyers should stay informed about market trends and consider bulk purchasing or long-term contracts to mitigate price volatility.