Every fit we make is designed specifically for boys — the right cut for the right body at the right age. Sizes 16 to 40, across six distinct styles.
We offer six carefully developed fit styles. Each one has been designed, tested, and refined over years of production. Scroll down to read about each one in detail, or jump directly using the links on the right.
Our Relax fit is built for boys who need space. Cut with extra room through the seat and thigh, it allows full freedom of movement without the bunching or pulling that tight fits cause during active wear.
This is the fit parents come back to most often for younger boys — it sits comfortably, does not restrict, and still looks clean and put-together when they need to look smart.
Available across our full range of washes from light indigo to dark charcoal. A true everyday workhorse fit.
The Comfort fit prioritises how the jeans feel against a boy's skin. Made from softer fabric blends with a gentle texture, it is ideal for boys who are sensitive to rougher denim or spend long periods seated — at school, at home, or travelling.
The waistband sits gently without digging in, and the overall cut avoids any pinch points. It looks like a standard well-fitted jean, but feels considerably more gentle throughout the day.
A favourite for school uniforms and family occasions where boys need to stay in their jeans for many hours at a stretch.
The Straight fit is the classic. A straight line from hip to hem — proportional, versatile, and never out of style. This is the cut that works for every occasion, every age, and every boy.
Not too tight, not too loose. The Straight fit is the benchmark against which we measure everything else. It has been in our collection since day one and remains one of our top sellers year after year.
Now available in the full size range from 16 to 40 — from toddlers to teens. Available in the widest range of washes and finishes of any fit we offer — from raw indigo to pre-washed white, and everything in between.
The Baggy fit is bold. Wide through the seat and thigh, with a relaxed leg that gives maximum freedom. It has a strong street-style character and is one of our most popular styles with boys of all ages.
Do not confuse baggy with sloppy. Our Baggy fit is cut with intention — it hangs properly, sits at the right height, and maintains its shape through washing. It is an intentional silhouette, not an oversized accident.
Available in all sizes from 16 to 40, making it one of our most inclusive fits across every age group.
R.Elastic — Relaxed Elastic — combines the look of a relaxed-fit jean with the ease of an elasticated waistband. It is our most practical fit, and the one that parents of younger boys ask for most.
The elasticated waist means no fiddling with buttons or zips, faster changes, and no waistband digging in during long periods of wear. The leg is cut with the same relaxed proportions as our Relax fit.
Available in the full size range from 16 to 40 — a comfortable, easy choice for boys at every age.
The Bootcut is fitted through the thigh and flares gently from the knee down. It is a classic silhouette that suits a wide range of body types and has a more formal, put-together appearance than our other styles.
Particularly popular for family occasions, festivals, and any event where a boy needs to look sharp without being uncomfortable. The slight flare at the hem makes it pair well with sneakers and formal footwear alike.
A distinguished cut that is increasingly hard to find in boys' sizing — we have kept it in our range because the demand for it has always been consistent.
We are always working on new styles. These are in development and will be added to our range in the coming months. Stay tuned via our Instagram @s45_jeans.
Our sizes are garment sizes, numbered 16 through 40. The size number directly represents the length of the jeans in inches — size 16 is a 16-inch length jean, size 40 is a 40-inch length jean. Each size corresponds to an approximate age range. If your boy is between sizes, we always recommend sizing up for comfort and growing room.
| S45 Size | Jean Length | Approx. Age | Fits Available | Notes |
|---|---|---|---|---|
| 16 | 16 inches | 1 – 2 years | Straight, R.Elastic, Baggy | Elastic waist strongly recommended |
| 18 | 18 inches | 2 – 3 years | Straight, R.Elastic, Baggy | – |
| 20 | 20 inches | 3 – 4 years | Straight, R.Elastic, Baggy | – |
| 22 | 22 inches | 4 – 5 years | Relax, Comfort, Straight, Bootcut, R.Elastic, Baggy | All 6 fits available from this size |
| 24 | 24 inches | 5 – 6 years | Relax, Comfort, Straight, Bootcut, R.Elastic, Baggy | – |
| 26 | 26 inches | 6 – 7 years | All 6 fits | – |
| 28 | 28 inches | 7 – 8 years | All 6 fits | – |
| 30 | 30 inches | 8 – 10 years | All 6 fits | – |
| 32 | 32 inches | 10 – 11 years | All 6 fits | – |
| 34 | 34 inches | 11 – 12 years | All 6 fits | – |
| 36 | 36 inches | 12 – 13 years | All 6 fits | – |
| 38 | 38 inches | 13 – 15 years | All 6 fits | Teen range |
| 40 | 40 inches | 15 – 16+ years | All 6 fits | Largest standard size |