Type 1 hair describes thin, straight hair — a type of hair that’s common in the UK. Around 45% of people of European descent have straight hair, while 40% have waves and just 15% have curls [1]. 1a hair is the finest, straightest type of hair according to this classification.
Knowing your hair type makes a big difference when caring for your locks. Different hair types need different products, styling rituals, and care routines to keep them looking their best. They also face different challenges when it comes to texture, breakage and hair loss. Here, we’ll discuss:
Type 1a hair is the straightest hair type in the hair typing system. Lacking any kind of wave or curl pattern, it’s characterised by flat, smooth lengths from root to tip.
The chart above shows the full range of hair types:
Type 1 hair is known for being generally low-maintenance, as it is naturally smooth and responds well to styling tools. However, this kind of hair comes with its own challenges, which we will discuss later in this article.
Type 1 hair is split into three distinct subtypes: 1a, 1b, and 1c. 1a hair often has a lower density than 1b or 1c, meaning fewer hairs per square inch on your scalp. It’s naturally silky lacks texture, making it harder to style than the other subtypes, and it is more prone to hair breakage due to its thinness. 1a hair does not shrink at all when wet because it has no curl or wave pattern.
1a hair in men follows all the same rules as for women. While it’s very easy to maintain a simple cut, the lack of texture can limit the kind of styles that suit you, especially if you want a hairstyle to hide a receding hairline, or a haircut for balding on top.
1b hair, meanwhile, is straight but may have a slight wave or bend. It is less flat than 1a hair, and its strands are slightly thicker. 1c hair tends to have coarser strands than 1a and 1b types, making it less lustrous but also easier to curl than the other types. It is thicker and more voluminous, which also makes it more prone to frizz, oiliness, and flyaways.
Still unsure if you have 1a hair? Take our hair type quiz to find out.
1a hair presents unique challenges when styling and keeping it healthy. If you have this hair type, here are some of the day-to-day issues you may face:
You need a tailored care routine to keep your hair smooth, shiny, and healthy. Here are some tips to keep your 1a hair as healthy as possible.
Here’s some shampoo advice for 1a hair: use a mild shampoo designed for regular use and wash your hair every 2-3 days. This helps prevent a buildup of natural oils without overstripping them. Avoid shampoos with harsh sulphates, which can lead to dry, brittle hair. If this has already happened, the best shampoos for dry hair may help restore some moisture to your locks and hair thickening shampoo can make it appear fuller and healthier.
Only use lightweight conditioner, and avoid applying it at the roots. Condition from the middle of your shafts to the tips, adding smoothness to your hair and highlighting its silky nature without weighing it down.
Heat styling can cause damage and dryness, particularly in delicate 1a shafts. Keep it to a minimum, and use a heat protection spray when styling with heat tools.
It’s best to use tools at a low temperature to prevent heat-damaged hair, although this can be challenging as 1a hair is often harder to curl than types with more texture. Air dry whenever possible and opt for the lowest heat setting to achieve your desired style.
1a hair needs lightweight products like serums, mousses, andor light-hold hairsprays, which can add volume and definition without making your hair too heavy and flat. Oily, heavy styling products are not designed for 1a hair, and they may be the reason your hair looks greasy.
Avoid overloading your hair with product – even lightweight products can weigh it down if used excessively. Use a small amount of product and apply it evenly throughout your hair.
As a more delicate hair type, 1a hair is vulnerable to split ends. Regular trims remove damaged strands and split ends before they travel up the hair shaft and cause further breakage. This also helps to prevent tangling and knots, making it easier to style.
Layered haircuts work well for 1a hair, adding body and movement to a hair type that can sometimes appear flat. However, regular trims are required to maintain layers – aim to schedule a cut every 6-8 weeks.
For men with 1a hair, consider a style like a French crop or a skin fade. By going extra short on the back and sides, you can create the illusion of volume through the lengths of your hair, even if it’s deceptively flat and straight. Avoid long layerless styles, as this can make your hair look lank and lifeless.
Looking to invest in your hair health? Here are the best volumising, styling, and damage-protecting products for hair growth and thickness:
Hair loss can occur with any hair type. It’s no more or less common in people with straight hair than those with wavy, curly, or coily hair. Hair thinning is influenced by several different factors, which we will explore here.
Genetics can play a big role in certain hair loss conditions, such as male pattern baldness [2] and female pattern baldness [3]. Research also shows that some autoimmune conditions that can cause hair loss, such as alopecia areata, also have a genetic component [4].
Having 1a hair does not make you more susceptible to these conditions. But if you have 1a hair and close relatives with these types of hair loss, you may have a greater chance of experiencing them yourself.
Research shows that psychological stress can prevent hair growth and damage healthy hair [5]. Acute or chronic stress can cause a type of hair loss called telogen effluvium [5] and worsen hair loss in conditions such as androgenetic alopecia and alopecia areata [5].
The good news is that stress-relieving strategies to reduce hair loss may help you in this instance, whether you have 1a hair or another type. Breathwork, getting out in nature and spending time with loved ones are some of the ways that may help you regain hair loss from stress.
Hormonal changes, such as those we experience during puberty and menopause, can contribute to hair loss regardless of hair type. Hair thinning is one of the most common ailments for women going through menopause [6]. The likelihood of female pattern hair loss also increases significantly after menopause, affecting around 52% of post-menopausal women [7].
20% of girls experience some level of hair loss during puberty [6], and this is slightly more common in teenage boys, who may experience a slightly receding hairline and mild temple hair loss [86]. Occasionally, this teenage hair loss can be the start of pattern baldness for boys or girls.
Women who have recently given birth may also experience hormone-related postpartum hair loss. During pregnancy, hormonal changes cause hair follicles to remain in the anagen (growth) phase for longer than normal, followed by a sudden drop in hormone levels 3-6 months post-delivery.
This returns hair follicles to the telogen (resting) phase, which can lead to excessive hair shedding, known as postpartum telogen effluvium [97]. In less common cases, pregnant women may experience hair loss as well due to hormonal changes.
Certain medical conditions and medications can cause hair loss in people with 1a hair and other types. For example, chemotherapy hair loss is well-documented in cancer patients receiving this treatment. Many other medical conditions can cause or worsen hair loss, such as a yeast infection on your scalp or tinea capitis [10], a scaly fungal scalp infection.
Excessively tight hairstyles, including tight buns or ponytails can cause hair loss. This type of hair loss is known as traction alopecia, in which constant pulling on the scalp leads to hair falling out.
This condition can affect people with any hair type. However, it is more commonly seen in women of African descent who have tightly curled or spiral hair, [11] affecting 31.7% of African women [12]. This is due to the use of hairstyles such as braids or cornrows that place a lot of pressure on the scalp, as well as chemical straightening treatments that damage the hair.
Prevention is better than cure, so follow the care tips for 1a hair and make sure you’re living a healthy lifestyle, including eating a diet for healthy hair, to prevent hair loss.
But if you have hereditary hair loss, you may lose hair regardless of how well you take care of it. You’ll only know if you have this type of hair loss when you notice the first signs of hair thinning and balding.
If you start to notice more hair loss in the shower than usual, book a consultation with a trichologist. They can diagnose the reason your hair is falling out and recommend a treatment plan to restore your locks.
In more severe hair loss cases, your trichologist may recommend a hair transplant. Here’s some good news for people with 1a hair – straight or wavy hair is the easiest type of hair for surgeons to perform a follicular unit extraction (FUE) hair transplant on [13].
The best hair transplant surgeons in the UK, such as those at Wimpole Clinic, have extremely high success rates. Check out our before and after hair transplant gallery to see our results for yourself.
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