Studies have proven that heat in general has a similar effect to a painkiller, effectively “deactivating” pain at a molecular level. In this way, completely naturally and without any chemicals, heat shuts down the regular pain response and helps with issues such as menstrual pain, neck tension, and abdominal cramps, and even diseases such as endometriosis or Crohn’s disease. However, hot-water bottles by themselves do not ease pain. UCB does not claim the capability of a medical device. In case of doubt, consult your doctor or pharmacist.

Yes! The Foundly hot water bottle is designed for both heat and cold treatments. Simply fill it with cold water and place it in the fridge for a refreshing cooling effect.

Important: Always cover the bottle with a soft cloth or fabric before applying it to your skin to prevent direct contact and ensure a comfortable, safe experience.

Heat therapy is a well-known method for alleviating menstrual cramps and endometriosis-related discomfort. It works by relaxing the uterine muscles, which reduces the intensity of contractions that cause pain. Additionally, heat increases blood flow to the pelvic area, improving oxygen supply to tissues and helping to reduce cramping.

For individuals with endometriosis, heat can also help soothe inflamed tissue and decrease muscle tension in surrounding areas, which may contribute to pain relief. A study from University College London even suggests that heat applied at 40°C can deactivate pain receptors, offering a natural, non-invasive way to ease discomfort.

While heat therapy provides temporary relief, it’s important to consult a healthcare professional for long-term management of menstrual or endometriosis pain.

Yes. The fact that heat relieves abdominal pain, such as colic or menstrual pain, has been scientifically proven by a UCL (University College London) scientist. Dr. Brian King, of the UCL Department of Physiology, led the research that found the molecular basis for the long-standing theory that heat provides relief from internal pains. For more information visit: Uniersity College London

Heat therapy can effectively relieve muscle tension, joint stiffness, and chronic pain conditions such as lower back pain, menstrual cramps, and arthritis. It is also beneficial for conditions like endometriosis and Crohn’s disease, where abdominal warmth can help relax muscles and alleviate cramping. After intense physical activity, heat can support muscle recovery by increasing blood circulation, reducing stiffness, and promoting relaxation.

Scientific research from University College London (UCL) has confirmed that heat doesn’t just provide comfort but actively deactivates pain at a molecular level. According to Dr. Brian King, heat over 40°C activates heat receptors (TRPV1), which then block P2X3 pain receptors—the same receptors that detect pain signals from tissue damage. This process works similarly to painkillers, offering temporary relief from internal pain such as menstrual cramps, colic, or bladder pain.

Our Hot-Water Bottle is developed according to international safety standards, including the British Safety Standard (BS 1970:2012), ensuring durability, leak protection, and heat resistance. The high-quality material undergoes rigorous testing for elasticity, pressure resistance, and aging to prevent cracks or deformation. A secure closure system and an extra-large funnel make filling safer and easier, minimizing the risk of spills. Certified, Foundly prioritizes both comfort and safety—so you can enjoy warmth with peace of mind.

urrently, we have 2 belt sizes available in our shop. Size 1 has a length of 110cm and is designed for clothing sizes S/M. Size 2 has a length of 125cm and is designed for clothing sizes M/L.

With every Urban Cross Bottle sold, a fair trade premium directly supports rubber tappers and plantation farmers, ensuring fair wages, better working conditions, and sustainable farming practices.

As a proud partner of Fair Rubber e.V. (fairrubber.org), Foundly is committed to ethical sourcing. The Fair Rubber certification guarantees that the natural rubber used in our products is harvested under socially and environmentally responsible conditions. This initiative helps fund healthcare, education, and community development projects for rubber-producing communities.

By choosing Foundly, you're not just investing in high-quality, sustainable warmth—you're actively supporting fair trade and a better future for rubber farmers worldwide.