Fabric science, made practical
Quick answer: when you overheat easily, do not shop by fibre name alone. A hijab's thermal comfort is shaped by the whole textile system: fibre chemistry, yarn structure, knit or weave, thickness, mass, porosity, air permeability, moisture behaviour, how tightly it is wrapped, and how many layers sit around the head and neck.
That is why two scarves both labelled “modal” can feel completely different, and why a very light-looking scarf can still feel warm once it is folded several times over an undercap.
First: “breathable” is not one measurable thing
In everyday fashion language, breathable often means “does not feel stuffy.” In textile engineering, several separate properties contribute to that feeling. Air permeability describes how readily air passes through a textile. Water-vapour transport relates to moisture moving as vapour. Moisture absorption describes how much water the fibres themselves can take up. Thermal resistance, fabric thickness and the air trapped between skin, hair and cloth also matter.
Science note
Research on knitted cellulose fabrics shows that heat transfer is strongly influenced not only by the fibre polymer but by yarn surface, capillary structure, porosity and the distribution of air inside the fabric. In other words, “viscose,” “modal” or “cotton” on a label cannot by itself predict exactly how cool a finished scarf will feel.
Why fewer layers can matter
Clothing-comfort research also shows that the air space between the body and clothing changes heat transfer. Fit, openings and movement influence how that air is exchanged. Around the head, the same principle means that an undercap, a tightly wrapped first layer, multiple folds and a second scarf layer can create a different microclimate than a simpler single-scarf system.
This does not mean “looser is always cooler.” Very large still-air spaces can insulate, while moving air through openings can increase heat exchange. The useful lesson for everyday styling is simpler: layer count, wrap tension and ventilation matter alongside fibre content.
Fibre
What the yarn is made from: for example modal, viscose, nylon/polyamide or spandex.
Construction
How yarn becomes fabric. Jersey is a knit structure; it is not a fibre.
Mass & thickness
More material around the head can increase insulation even when the fibre itself handles moisture well.
Layers & fit
An undercap, folds and wrap tension change the air spaces through which heat and moisture must move.
What modal contributes—and what it does not guarantee
Modal belongs to the family of regenerated cellulosic fibres. These fibres are cellulose-based rather than synthetic polyamides. Laboratory textile studies commonly find that regenerated-cellulose fabrics interact readily with moisture, but their final comfort performance varies with yarn and fabric construction.
That distinction matters. A modal fibre can be spun into different yarns, knitted or woven at different densities, blended with other fibres and finished in different ways. So “modal = cool” is too simplistic. A better question is: what is the composition, construction, weight and layering system of this particular hijab?
Why nylon and spandex might be blended into jersey
Nylon is a synthetic polyamide. Compared with regenerated cellulose, polyamide generally has lower moisture affinity, although it is not completely non-absorbent. In blends, nylon can also change strength, surface feel and durability. Spandex is an elastic segmented-polyurethane fibre; even a relatively small percentage can contribute stretch and recovery to a textile.
But again, fibre percentages do not let us calculate the exact stretch, air permeability or temperature of a finished hijab. Those properties need to be measured on the actual fabric.
What to look for if you run hot
Reduce unnecessary layers
If your scarf can stay secure without a separate undercap, removing that layer may simplify the thermal and moisture path around the head.
Check fabric density
A compact, heavy knit and a light open knit can behave differently even with similar fibre names.
Avoid over-wrapping
Repeated folds at the neck or crown increase local fabric thickness.
Prioritise a stable first layer
A scarf that grips comfortably may need fewer pins, folds or corrective adjustments through the day.
A Hazal option built around fewer styling layers
The product below should be understood as one specific construction—not proof that every modal jersey behaves the same way.
Hazal Studios · Hijab
Premium Tie-Back Modal Jersey Hijab
60% modal · 35% nylon · 5% spandex
178 × 72 cm · One Size · integrated tie-back band · designed to be worn without a separate undercap.
Does dark colour automatically make a hijab hotter?
Colour can affect how a surface interacts with radiant energy, especially in direct sun, but the real-life result on the head is not determined by colour alone. Shade, fabric mass, air movement, exposure time, construction and layering all interact. For everyday buying, a lightweight, well-ventilated dark scarf can be more comfortable than a pale but dense, heavily layered scarf.
What about sweating?
Sweating cools the body when moisture can evaporate. Clothing can influence how quickly heat and moisture leave the skin. A fibre that absorbs moisture may temporarily hold some of it within the textile; a less absorbent fibre may move liquid differently. Neither behaviour is automatically “better” in every environment because humidity, airflow and fabric structure change the outcome.
A useful shopping rule
When comparing hot-weather hijabs, ask five questions: How many layers will I need? How heavy is the fabric? How dense is the construction? How stable is the wrap? What is the actual fibre blend? Those questions are more useful than a single marketing word such as “cooling.”
Frequently asked questions
Is modal always cooler than polyester or nylon?
No. Fibre chemistry affects moisture and thermal behaviour, but the finished textile's thickness, porosity, yarn structure, surface, fit and layers can outweigh a simple fibre comparison.
Is jersey a material?
No. Jersey is a knitted fabric construction. It can be made from modal, viscose, cotton, polyester, nylon, blends and other fibres.
Will removing an undercap definitely make me cooler?
Not necessarily in every condition, but it removes one fabric layer. Whether that feels more comfortable depends on the scarf, your wrap, hair, environment and personal thermal sensitivity.
Does 5% spandex mean the hijab stretches 5%?
No. Fibre percentage and mechanical stretch are different measurements. Exact stretch and recovery depend on yarn, knit construction and finishing.
Research notes
This guide separates general textile science from Hazal Studios product specifications. For the science discussion, we consulted research on thermal behaviour of knitted natural and regenerated-cellulose fabrics, modal/polyamide knitted textiles, and clothing air-gap heat transfer. Product composition and measurements above come from the current Hazal Studios product specification.
Stanković, Popović & Poparić — thermal properties of textile fabrics · Tomljenović et al. — modal and micro-modal knit comfort properties · 2024 study — clothing air gaps and thermal comfort