The Tree Mat is made from dry Natural Rubber from the rubber tree making this an ecologically sound yoga mat. The Tree Mat also has the best grip of all our mats, which combined with good shock absorption and abrasion resistance make this mat the one to beat. Tested by SGS Laboratories as free of Heavy Metals & AZO dyes 183cm x 60cm x 4mm. Weighs 2Kg Washable - air dry avoiding sunlight Diffferent coloured top and bottom choice of: Black & Green, Blue & Slate or Aubergine & Lavender bottom. Please note: As the colour of natural rubber vaires considerably from batch to batch, this affects the finished colour of the mat also so colours may be lighter or draker from those shown. This product is made from natural rubber which has the same origin as latex and though very different in properites, if you have a latex allergy it would be wise to choose a different mat