The lower back and jumpers that ride up
Short answer: A jumper that rides up at the back leaves the lower back bare and cold. Choose a length that covers, and a cut that is not dragged upwards when you bend or reach, so the lower back stays settled all day.
Why the jumper climbs up
When you bend forward, the fabric at the back is pulled upwards, and when you reach up for something, the whole top lifts. Short clothing, smooth surfaces and a loose hem give no grip, so the jumper rides up and stays up. That is especially annoying on cold days, when the lower back quickly feels the chill. Length and cut are therefore just as important as the fabric itself when you choose tops for everyday wear.
Length at the back makes the difference
Measure how long the jumper is at the back and compare it with your own back. It should reach at least over the waistband, even when you bend. Many models are a little longer at the back, and that is often an advantage. See bamboo sweatpants for women, where the height of the waistband decides where the jumper needs to end to lie calmly. A jumper that sits close but does not constrict is less likely to bunch up.
Waistband and hem of the jumper
A jumper with a ribbed hem stays put better than one with a straight seam edge, because the rib holds on to the body. The rib must not constrict, though. If the hem sits at the waist, it can catch the waistband of the trousers and hold the clothing down. Choose a soft, elastic hem. If it is too loose, it slides, and if it is too tight, it can cause discomfort. Stretch your arms above your head and see whether the jumper follows.
Layers that stay put
A thin inner layer tucked into the trousers makes it harder for the outer layer to pull the whole top up. See bamboo socks for women if you also want warm feet while the lower back is kept warm. It is often the interplay of several layers that creates comfort. When the base layer stays put, the outer layer can move a little without you getting cold across the back.
Discomfort around menstruation
Some people experience sensitivity or cold in the lower back around menstruation, and then the length and softness of clothing are extra important. Period underwear can be a practical solution for some, and you should follow the product's own instructions. See period underwear. Choose soft waistbands that do not press on the stomach or lower back. If you have severe pain or heavy bleeding, talk to your doctor, as clothing cannot relieve it.
Care so the cut lasts
Wash at 30 to 40 degrees and avoid fabric softener, which can make the fabric less breathable and the rib less elastic. Hang jumpers up or let them dry flat so they are not pulled crooked. Viscose from bamboo is soft but more vulnerable when wet, so lift it carefully. A jumper that has lost its shape at the hem will ride up more than a new one, so check regularly that it still sits as it should.
Frequently asked questions
Why does my jumper ride up when I bend
Because the fabric is pulled upwards at the back, and short clothing or a loose hem has nothing to hold on to. A longer cut helps.
Does it help to tuck the jumper into the trousers
Yes, especially with a thin inner layer. It stops the whole top following up, and the lower back stays covered.
What should I do if my lower back is sore or cold
Keep it warm with a longer layer. If you have lasting pain, talk to your doctor.
You can find the full range at Bamboo-Clothing.com.
