The Rite in the Rain All-Weather Field Memo Book was originally developed for the us military, this soft cover books are made to survive. Rite in the Rain uses only the most durable glues and materials to ensure your book won't fall apart in the field.Features The heavy-duty "perfect binding" holds strong through bad weather and years of abuseField-Flex covers easily conform to pockets or packs, yet spring back into shape - no worse for the wearRulers, conversion charts, and map scales printed on the cover prove handy in the fieldSheet size- 3.125" x 6"Non Perforated