4F

Complete Size Guide for Clothing & Footwear

About 4F Sizing

4F is a Polish sports and lifestyle brand specialising in high-quality apparel and footwear designed for active individuals. The brand combines functional design with contemporary styling, offering a comprehensive range of clothing for men, women, and children. 4F is particularly renowned for outdoor wear, including jackets, trousers, and winter clothing, as well as casual sportswear.

4F's sizing philosophy emphasises comfort and performance, with garments designed to accommodate movement and layering. The brand uses European sizing standards, which means their sizes align primarily with EU measurements. However, 4F caters to an international customer base, providing conversions to UK and US sizes to ensure customers worldwide can find their perfect fit.

The brand is known for offering true-to-size fits across most of their range, though some collections — particularly technical outdoor wear — may feature slightly roomier cuts to allow for layering underneath. This is ideal for hiking, skiing, and other outdoor pursuits where versatility is essential. Whether you're shopping for everyday casual wear or technical sportswear, understanding 4F's sizing system ensures you select the correct garment on your first purchase.

How to Measure Your Body

To find your correct 4F size, you'll need to take accurate body measurements. Follow these steps for the most precise results:

1. Chest/Bust: Measure around the fullest part of your chest or bust, keeping the measuring tape parallel to the ground. The tape should sit comfortably under your arms without being pulled too tightly. This measurement is crucial for selecting the correct size in tops, jackets, and dresses.
2. Waist: Find your natural waistline — this is typically where your body creases slightly when you bend forward, or where you naturally wear your trousers. Measure around this point horizontally, keeping the tape snug but not tight. Do not pull the tape so firmly that it compresses your body.
3. Hips: Measure around the fullest part of your hips and bottom. Stand with your feet together and place the measuring tape horizontally. This measurement is essential when selecting trousers, skirts, and fitted dresses.
4. Inside Leg Length: For trousers, measure from the inner top of your thigh (at the crotch) down to the floor, whilst wearing shoes. Ensure your feet are positioned normally, not stretched. This measurement determines the length of your trousers and prevents uncomfortable hem lengths.
5. Shoulder Width: Measure across your shoulders from the outer edge of one shoulder to the outer edge of the other, at the widest point. This helps determine how well jackets and tops will fit across your frame.
6. Sleeve Length: Measure from the centre of your back neck, across your shoulder, and down to your wrist with your arm bent at a 90-degree angle. This ensures jacket sleeves and long sleeves are the appropriate length.
7. Timing Matters: Take measurements in the afternoon or evening when your body is at its largest, as feet and limbs can swell throughout the day. Measure whilst wearing minimal clothing for accuracy, and consider asking someone to assist you for the most precise results.
8. Use a Soft Tape Measure: Always use a flexible fabric measuring tape rather than a rigid ruler. Metal tape measures or hard rulers will not conform to your body's contours and will give inaccurate measurements.

Women's Clothing Size Chart

4F women's sizes are based on EU standards but have been converted to UK and US equivalents for international shoppers. The chart below provides comprehensive measurements for chest, waist, and hip dimensions to help you select the most flattering fit.

4F Size	UK Size	US Size	EU Size	Chest (inches)	Waist (inches)	Hips (inches)
XS	6	2	34	31–33	24–25	33–35
S	8	4	36	33–35	26–27	35–37
M	10	6	38	35–37	27–28	37–39
L	12	8	40	37–39	29–30	39–41
XL	14	10	42	39–41	31–32	41–43
XXL	16	12	44	41–43	33–34	43–45
XXXL	18	14	46	43–45	35–36	45–47

Men's Clothing Size Chart

4F men's sizes utilise EU sizing standards with conversions to UK and US measurements. The chart provides chest, waist, and hip dimensions to guide your selection of the perfect fit for shirts, jackets, and trousers.

4F Size	UK Size	US Size	EU Size	Chest (inches)	Waist (inches)	Hips (inches)
XS	32	XS	44	34–36	28–29	34–36
S	34	S	46	36–38	29–30	36–38
M	36	M	48	38–40	30–31	38–40
L	40	L	50	40–42	32–33	40–42
XL	42	XL	52	42–44	34–35	42–44
XXL	44	XXL	54	44–46	36–37	44–46
XXXL	46	XXXL	56	46–48	38–39	46–48

Children's Clothing Size Chart

4F offers a comprehensive range of children's clothing sized by age and height. The following chart helps parents and guardians select the appropriate size based on their child's measurements.

4F Size	Age (approx)	EU Size	Height (cm)	Chest (inches)	Waist (inches)
80	12 months	12M	75–80	20–21	19–20
86	18 months	18M	80–86	21–22	20–21
92	2–3 years	2T	86–92	22–23	20–21
98	3–4 years	3T	92–98	23–24	21–22
104	4–5 years	4T	98–104	24–25	22–23
110	5–6 years	5	104–110	25–26	23–24
116	6–7 years	6X	110–116	26–27	23–24
122	7–8 years	8	116–122	27–28	24–25
128	8–9 years	9	122–128	28–29	25–26
134	9–10 years	10	128–134	29–30	26–27
140	10–11 years	11	134–140	30–31	27–28
146	11–12 years	12	140–146	31–32	28–29
152	12–13 years	13	146–152	32–33	29–30

Footwear Size Chart

4F footwear, including trainers, boots, and casual shoes, follows standard European sizing conventions. The chart below provides conversions between UK, US, and EU sizes, along with foot length measurements in centimetres for precise fitting.

UK Size	US Men's	US Women's	EU Size	Foot Length (cm)
3	–	5	36	22.1
3.5	–	5.5	36.5	22.5
4	–	6	37	23
4.5	–	6.5	37.5	23.5
5	–	7	38	24
5.5	–	7.5	38.5	24.5
6	7	8	39	24.8
6.5	7.5	8.5	40	25.4
7	8	9	41	25.7
7.5	8.5	9.5	41.5	26
8	9	10	42	26.3
8.5	9.5	10.5	42.5	26.7
9	10	11	43	27
9.5	10.5	11.5	43.5	27.3
10	11	12	44	27.9
10.5	11.5	12.5	44.5	28.3
11	12	13	45	28.6
11.5	12.5	13.5	45.5	29
12	13	14	46	29.4
13	14	–	47	30.2

4F Size Guide for Specific Products

Jackets & Outerwear

4F jackets, including ski jackets and waterproof outer layers, are designed with the intention of layering in mind. These garments typically feature a slightly more generous cut through the chest and shoulders compared to everyday casualwear, allowing you to wear thermal layers, fleece, or base layers underneath without restriction. If you're purchasing a 4F technical jacket specifically for outdoor activities, your standard clothing size will usually be appropriate. However, if you run particularly lean or have a narrow frame, consider sizing up by one size to ensure comfortable layering capacity and freedom of movement. The sleeves on 4F jackets are designed to sit slightly longer than casual tops to provide additional wrist coverage when arms are extended.

Trousers & Bottoms

4F trousers come in various styles, from casual chinos to technical outdoor bottoms. The inside leg length is particularly important when ordering trousers online. Measure your inside leg length whilst wearing shoes, and select the size that most closely matches your measurement. 4F typically offers extended size ranges, including petite and tall options for women's trousers. If you fall between two sizes, consider the rise and fit of the specific style: wider-fitting trousers may require you to size down slightly, whilst slim or tapered fits might benefit from your standard size.

Base Layers & Thermal Wear

For thermal base layers and thermal underwear, 4F recommends selecting your standard clothing size. These items are designed to fit close to the body without excessive bulk, allowing them to work effectively under other garments. However, if you intend to layer multiple thermal items (such as a thermal shirt under a thermal long-sleeved top), you may benefit from selecting a slightly larger size to avoid excess compression.

Trainers & Sports Shoes

4F trainers typically follow standard European shoe sizing and are true to size for most wearers. Measure your foot length in centimetres using the sizing chart above, and select the EU size that matches your measurement. If you have particularly wide feet, consider reading customer reviews for the specific model, as some 4F trainers may run narrower than others. Always ensure you have adequate toe room — there should be approximately a thumb's width of space between your longest toe and the end of the shoe.

Sizing Tips for 4F

• Always measure your body in the afternoon or evening when your body is at its largest, as feet and limbs naturally swell throughout the day. This ensures you select a size that will fit comfortably all day long.
• For technical outdoor wear and jackets, consider sizing up one size to ensure ample room for layering thermal base layers and insulating mid-layers, which is essential for comfort during winter sports and outdoor activities.
• Check customer reviews and feedback before purchasing, particularly if you're shopping online. Many reviewers mention whether items run small, large, or true to size, providing valuable insights specific to the product you're considering.
• When ordering footwear,