Wool

Name: Wool
Author: Hugh Howey
ISBN: 9781476733951

Age Rating, Reading Level & Content Guide

by Hugh Howey

Silo · Book 1

Reading Level 7 ME · Moderate · Emotional Ages 13+ Balanced Read

The text is written at a 7th grade reading level, the subject matter is intended for teens (ages 13+), and the content has moderate intensity with some emotionally heavy themes. Its HootRating code, ME, means moderate content, mostly emotional.

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About This Book

In a future where the outside world is toxic and unlivable, people survive in vast underground silos. Jules begins to uncover the dark secrets hidden within their confined home, challenging everything she thought she knew. Danger and mystery lurk around every corner in this gripping tale of survival and truth.

Themes

Science & Nature Survival Mystery

Quick Assessment

This is a Level 7 book with moderate content intensity. Content themes include physical danger, fear & anxiety. Written for readers ages 13+.

Why we rated Wool ME (Moderate)

Wool is written at a Level 7 reading level across 508 pages. Upper Grades (Ages 13+) is the typical interest range for this book — readers in that age band have the maturity and attention span suited to the story, separate from whether they can decode the words.

We rate Wool as ME (Moderate, mostly emotional) because the content sits in the "Moderate" range — moderate conflict that may involve loss, scary scenes, or interpersonal stakes. The strongest signals come from emotional weight, physical peril — these are the dimensions parents should evaluate against their reader's tolerance.

Specific content flags noted by reviewers: Physical Danger, Fear & Anxiety.

Thematically, Wool explores science & nature, survival, and mystery — these threads give the book room to mean different things to different readers.

Good fit for

✓ Children in the Ages 13+ range — the maturity and attention span match the story's pacing.
✓ Kids drawn to stories about science & nature, survival, mystery.
✓ Readers who fall hard for one book and want a long series to live in — there are 2 more books in the Silo series.

Maybe not for

! Readers who get easily upset by emotional or moderately dark scenes — the conflict here is real, not just background flavor.

For Parents

Content Intensity

ME · Moderate · Emotional

Emotional

Moderate ←

Physical

Moderate

Social

Gentle

Thematic

Gentle

Reading the HootRating code: the first letter is the content intensity (C = Gentle · L = Mild · M = Moderate · I = Intense · V = Very Intense); the second, when there is one, is the kind of content that drives it (E = Emotional · P = Physical · S = Social · T = Thematic). Reading level and age range are rated separately. How we rate

Real stakes and emotional weight. May include sustained danger, loss, or bullying.