Deciding between microfiber and 100% cotton for bed sheets can feel as challenging as finding the perfect mattress. These two fabrics dominate the bedding market and often leave consumers pondering: which one is truly better?

Let's dive deep into the science and features of both materials.

Microfiber

Microfiber sheets are crafted from incredibly fine synthetic fibers, finer than a single strand of silk. They are predominantly made from polyester fibers, sometimes blended with polyamides.

Advantages:

1. Moisture Management: Microfiber bed sheets excel in wicking moisture. Their ability to quickly release moisture ensures they remain largely dry, especially beneficial on hot nights.
    
2. Durability: Compared to many other sheet types, microfiber offers a robustness that stands up to frequent washings without showing signs of wear.
    
3. Softness: The dense composition of tiny fibers in microfiber sheets provides an extraordinary smoothness, making them soft to the touch.
    
4. Affordability: Generally, microfiber sheets present a cost-effective choice for many households.
    
5. Dirt-Resistant: Thanks to the compactness of the fibers, microfiber sheets can repel small dirt particles more effectively.

However, being a synthetic fabric, microfiber sheets might feel less breathable than their natural counterparts, potentially causing overheating for some sleepers.

100% Cotton Sheets

Cotton sheets have been cherished for generations. Extracted from the cotton plant, they have various grades, with Egyptian cotton and Pima cotton standing out as the epitome of luxury.

Advantages:

1. Breathability: Cotton sheets are revered for their natural breathability, allowing superior ventilation and ensuring cooler and more comfortable sleep.
    
2. Natural Texture: There's a tactile satisfaction from 100% cotton sheets, especially when they're of high-quality cotton fiber.
    
3. Hypoallergenic: For allergy sufferers, cotton bed sheets are often the preferred choice due to their hypoallergenic nature.
    
4. Moisture Absorption: Unlike microfiber, cotton sheets absorb and distribute moisture uniformly, reducing the clammy feeling on hot nights.

Nevertheless, they may retain moisture in humid climates, and their maintenance might require extra efforts, like employing fabric softeners or regular ironing.

A Side-by-Side Comparison:

1. Maintenance & Durability: Microfiber sheets tend to be more wrinkle-resistant and durable. Cotton, especially Egyptian cotton sheet sets, might need more attention to keep them in pristine condition, but their longevity, especially when maintained, is commendable.
    
2. Environmental Impact: Cotton bed sheets, being natural, are biodegradable. But responsible sourcing is essential due to the environmental challenges linked to cotton farming. 
   
   Microfiber production is often more energy-efficient than cotton. High-quality microfiber sheets have a longer lifespan, resulting in reduced waste. Recent innovations even allow for microfiber sheets to be made from recycled plastics, minimizing environmental impact.
    
3. Softness & Comfort: Cotton bed sheets, especially Egyptian cotton and Pima cotton varieties, are often celebrated for their plushness. However, many vouch for the uniform softness of microfiber, especially microfiber bed sheets designed for premium markets.
    
4. Cost-effectiveness: Microfiber often wins here, offering a blend of quality and affordability.

The Verdict:

There's no one-size-fits-all when considering microfiber sheets versus 100% cotton bed sheets. If you value a natural feel, breathability, and luxury, high-quality cotton sheets might be your go-to. If durability, softness, and affordability are high on your list, microfiber has its strong merits.

In the bed linen arena, choices are personal. The best sheets are the ones that cater to individual comfort, ensuring restful nights and cozy slumbers. 

Remember, whether you opt for the luxurious feel of an Egyptian cotton sheet or the silky touch of a microfiber sheet, the ultimate goal is peaceful, rejuvenating sleep.