Thread count not always a reliable indicator of sheet quality

A recent investigation into the quality of bed sheets has shed light on a long-held assumption among consumers: that higher thread counts are indicative of superior performance and comfort.

Researchers at the Good Housekeeping Institute Textiles Lab have been testing 353 sheet sets over the years, cross-referencing their findings with thread count to determine its relevance. The results show that there is no direct correlation between thread count and improved performance or a softer feel.

The study involved evaluating durability and performance using specialized equipment in the lab, as well as having consumer testers rate the softness of each sheet in a blind comparison.

A sheet's thread count refers to the total number of yarns present in a square inch of woven fabric. This measurement can give an indication of the quality and softness of the fabric, as finer yarns are more densely packed into the same area.

However, it is essential to note that thread count is not always a reliable indicator of a sheet's quality. In reality, some fabric types are unaffected by thread count, while in others it may be irrelevant or even misleading. Our testing has shown that the best cotton sheets typically have thread counts between 300 and 500.

While extremely high thread counts may seem desirable, our findings suggest that anything above 500 is not necessarily better. In fact, extremely high thread counts can be seen as suspicious, particularly if they exceed 1,000. Conversely, quality sheets with lower thread counts under 300 do exist, making it clear that this metric should be approached with caution and context.

A higher thread count can be an indicator of finer yarns used in bedding, but it's not the only factor at play.

When evaluating thread counts, it's essential to consider the fabric composition and weave type. Sheets made from materials other than 100% cotton with single-ply weaves may have misleading or irrelevant thread counts.

Some brands fail to disclose the percentage of cotton or ply when selling their products, adding to consumer confusion.

Manufacturers often use techniques to artificially inflate thread counts by using multiple-ply yarns or blending materials like polyester.

We evaluated a 1,400-thread-count cotton/polyester sheet set that employed one of these techniques to artificially inflate thread count. As expected, it did not rank high in our tests.

Other fabrics also have inherent limitations when it comes to thread counts. Rayon fibers, made from plants but chemically processed into semi-synthetic materials, can be manufactured into thin strands and are not comparable to cotton threads. Similarly, linen and silk sheets, despite being natural fibers, cannot match the thread count of cotton.

Cotton remains the most widely used sheet fabric due to its popularity. However, even among cottons, there is a distinction between regular cotton and longer-staple varieties like Pima and Egyptian cotton. These premium cottons produce softer and more durable fabrics. Cotton/polyester blends, on the other hand, offer durability and wrinkle-resistance at a lower cost, but may lack the natural feel of 100% cotton sheets.

When it comes to materials used in sheet sets, polyester often gets a bad rap for being stiff or scratchy. However, some types of polyester, such as microfiber and performance sheets, can actually feel super soft and even help wick sweat away.

Another material gaining popularity is rayon, which encompasses various types of "regenerated cellulose" fibers, including viscose, lyocell, and modal. These fibers are prized for their ultra-soft and smooth texture, often rivaling that of cotton sheets in terms of feel and breathability.

Despite their smoothness, however, rayon sheets tend to be thinner and less substantial than those made from natural materials like cotton. This is because the raw material used to make rayon is chemically processed before being turned into fibers, which can affect its density and overall feel.

When it comes to construction, the type of weave used in sheet sets can greatly impact their texture and durability. Percale weaves are typically grid-like and crisp, while sateen weaves feature yarns that float over multiple strands in the opposite direction, creating a soft and smooth surface.

Lexie Sachs, executive director of strategy operations at the Good Housekeeping Institute, brings her expertise in fiber science to the evaluation of bedding products, including sheets. With a background that includes rigorous testing and review of over 200 sets, she is well-versed in what makes a high-quality sheet.

In addition to percale and sateen weaves, other constructions such as flannel provide warmth for winter, while jersey-knit sheets offer a soft, T-shirt-like feel. Sachs' extensive experience and knowledge of fiber science inform her evaluations, providing readers with valuable insights into the world of bedding. Sheets come in a variety of materials beyond thread count alone.