A German bra size like 75B is a 34B in the US and UK. The reason: the band is measured in centimetres in Germany and the EU, but in inches in the US and UK. The cup letters only start to diverge from the E-cup upwards. This guide walks you through converting your bra size step by step, with a table and concrete examples.

The best fabric for underwear depends on what you want from it: certified-organic cotton is absorbent and hard-wearing for everyday, TENCEL Modal drapes silky-light, and TENCEL Lyocell regulates moisture especially well when you move. In this guide we sort the key materials by use case, so you know which fabric fits when.

Elastane, spandex and lycra are three names for the same synthetic fibre. This fibre gives almost every close-fitting garment its stretch and shape, but is rarely alone in the fabric: a few per cent is enough. We explain what elastane does, where its weaknesses lie, and which more circular alternative we already use at erlich textil.

A bralette is a wireless, usually unpadded bra that prioritises comfort over strong support. We explain the difference to a classic bra, the sizing system and who a bralette suits.

Linen is a natural fibre from the flax plant: cooling, breathable and long-lasting. We explain how linen is made, its properties, benefits and drawbacks, and how to care for it correctly.

Modal drapes silky-smooth and dries quickly, cotton is absorbent and familiar. We compare both fibres in feel, moisture, durability and care, and show when each suits you best.

Certified-organic cotton (kbA in German) is cotton grown to the EU organic standards (Regulation (EU) 2018/848): no synthetic pesticides, no artificial fertilisers, no GMOs. The main material in our cotton textiles is exclusively kbA or Cotton in Conversion (CiC). In the guide: definition, farming, CiC, comparison with modal and lyocell, care, and use in women's and men's ranges.

Lyocell is a cellulose fibre made from wood, typically eucalyptus or beech. We use TENCEL™ Lyocell from Lenzing, produced in a closed-loop process with over 99 per cent solvent recovery. In the guide: production, properties, comparison with modal and cotton, care, and how we use lyocell for women and men.

Modal is a cellulose fibre made from beech wood that drapes silky and regulates moisture better than cotton. We only use TENCEL™ Modal from Lenzing: FSC- and PEFC-certified beech, Eco Clean processing. In the guide: production, properties, comparison with cotton and lyocell, care.

Looking for an alternative to Organic Basics? We look at what has changed at Organic Basics and how erlich textil compares: materials, prices, production and transparency.